Back in 1987 Bill Murray sat in for regular Chicago Cubs colour commentator Harry Caray for a baseball game broadcast from the iconic Wrigley Field.

Asked for his assessment of his beloved Cubs' opponents that day, the Montreal Expos, the Caddyshack star began to complain about not being able to get his preferred brand of hotdog, launching into a rambling story about how they used to be cooked on an open grill nearby until there was a fire.

Murray's tangent was funny, proved his credentials as a regular attendee of Wrigley Field and helped to take the pressure off the commentators during a broadcast that requires quite a lot of colour to fill the quieter moments.

Few watching, no doubt delighted with the mere presence of the Groundhog Day actor, were too concerned with the fact Murray clearly knew less than nothing about the Montreal Expos.

Murray's baseball bow, which can be watched on YouTube, is a reasonable effort as it fulfills at least two of the functions of a colour commentator, but it is no home run.

The perfect colour commentator takes a load off the primary commentator, entertains (the clue is in the name) but also educates. For these three reasons it is not an easy gig.

Who has not gritted their teeth watching a match, where the individual alongside the commentator points out the obvious, repeats what has already been said or, most infuriatingly, describes in minute detail the replay as you watch it?

It is like having a bore on a barstool beside you in your living room. 

One of the joys of working in RTÉ Online during a major event like the World Cup is monitoring the social media during broadcasts.

Certain things always result in a spike. A row between pundits, a new face on the panel, Eamon Dunphy talking about Cristiano Ronaldo (The Cod) or a shock result.

The man most likely to get the mentions column on our Tweetdeck whirring however, is Brian Kerr.

He educates. 

Before this tournament started, who knew how Morocco were likely to line up in midfield? Not the people who compiled the FIFA team line-ups for their opener with Iran. But you know who did know?

"I’m not sure that’s actually how they’ll line up – Ziyech will be in a more advanced position, the three in the middle, El Ahmadi, Boussoufa and Belhanda, they’ll run the game for Morocco."

Brian Kerr.

Before revealing themselves as the most frustratingly negative team of decent footballers in Russia, FIFA had Carlos Quieroz's Iran pegged for an outfit that might risk a back three. Who knew otherwise?

"That’s showing them lining up with a back three, I’m not sure about that – Hajsafi and Amiri have both played at left-back for their clubs."

Brian Kerr.

Who knew Peru's Christian Cueva was nicknamed Aladdin?

Who knew Peru's qualification was aided by Bolivia fielding ineligible players in qualification?

Who knew the top scorer in the Tunisian league for the past two years?

It goes without saying that the man who helped mould some of the finest Irish footballers of their generation, knows more than the average TV watcher about the beautiful game.

The man who managed Irish teams to third in the World Youth Championships in 1997 and an unprecedented European double the next year at Under-16 and U18 level is expected to exhibit a level of insight above the norm.

We anticipate learning from the man who had the best win ratio (55%) of any permanent senior Republic of Ireland manager.

But he also entertains.

He described Serbia's Aleksander Kolarov as a "Dead-eye Dick" after he curled a free-kick into the top corner against Costa Rica.

One player in the Uruguay-Saudi Arabia match had his small shinpads described as "torn-up Kellogg's Corn Flakes packages", eliciting memories of letters to Shoot! and Match, where readers claimed to use copies of the magazines as shinpads to avoid not being allowed to play.

His bizarre vignette about Heiduke Honda's watch on each wrist and the Japanese players writing books on "training the mind" and "another one on yoga" is not your typical fare.

Finally, he aids his colleague.

This has been an exceptional World Cup, with more than 20% of the matches in the first 12 days seeing a winning goal in the 87th minute or later. We have had shocks, drama, soap operas, beautiful goals, calamitous goals and lots of video assistance for referees.

But even allowing for the unusually high quality of the entertainment on offer, the best matches have lulls. Even a classic has a trough or two and if you think Adrian Eames, Hugh Cahill, John Kenny and Stephen Alkin do not appreciate the mind, mouth and manner of Brian Kerr at those times you have never been charged with broadcasting for an hour and a half, plus stoppage time.

But his willingness to go into great detail on an issue mid-game, or unfurl an entertaining anecdote, is one of the reasons Kerr is not universally popular.

Remember those social media comments from earlier? There is a near 50-50 split regarding Kerr (which is more positive than most can hope for in the digital land of extreme views and diminishing empathy).

Brian Kerr talks too much, his accent is hard to listen to, he gets players' names wrong.

One tweet from the RTÉ soccer account in defence of Kerr resulted in an outpouring of support almost matched by the slew of dissenting voices. By the time everyone had their speak, 'Brian Kerr' was trending in Ireland.

Kerr is not vanilla, he is not to everyone's taste but no one can argue he is not genuine. 

To mark their 20th anniversary as part of RTÉ's soccer coverage, the lads from Aprés Match gave an interview to Mary Hannigan in the Irish Times where they bemoaned the lack of chaos that was allowed to reign under Bill O'Herlihy. 

While no one would describe the cogent Kerr as a chaotic co-commentator, he does bring a certain charm to the role. 

So Argentina's Mercado becomes Mikado and the country's population swells to 450 million during their dramatic win over Nigeria, but would you want anyone else describing Lionel Messi's wondrous goal or trying to decipher the thought process of the Albiceleste's ostracised manager, Jorge Sampaoli?

Brian Kerr is well-briefed, he is eloquent, he is entertaining and he is insightful.

Brian Kerr knows all about the hotdogs and the Montreal Expos.

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You can follow the FIFA World Cup  all the way with RTÉ. Live blogs of every game on RTÉ.ie and the News Now App, with 56 games live on RTÉ television and all 64 games available on the RTÉ Player.