The football qualifiers, or the 'backdoor' to most, has been part of the Championship summer since 2001.
It has given us more than a few intriguing clashes, and lots of upsets along the way.
Today's qualifier draw could provide one or two more.
Here we pick out some shocks in previous years.
2001: Sligo 0-16 Kildare 0-15 - Round 3
Fourteen-man Sligo completed a famous victory over Kildare in what was the Yeats county's first trip to Croke Park since 1975.
The Connacht side were already underdogs before the dismissal of corner-back Neil Carew after just eight minutes for an off-the-ball clash. Kildare used the extra man advantage to invite Sligo to attack, and the superb Dessie Sloyan punished the Lillywhites' defence with a string of points from frees and play.
At the other end, Eddie McCormack and Tadgh Fennin were both denied goals by Sligo keeper James Curran, and Kildare were four points down before Padraig Brennan, McCormack, John Finn and Anthony Rainbow all pointed to leave just a single point difference at half-time.
When Kildare scored five points to one in reply, it looked as if the favourites were finally going to take control. Brennan scored three times, and Dermot Earley and Martin Lynch also chipped in with points.
The turning point for Sligo was the introduction of Dara McGarty and Nigel Clancy, who added renewed impetus to the Sligo cause.
Aided by Eamonn O'Hara's powerful surging runs, they hit six points on the trot against stunned Kildare.
2006: Laois 0-09 Tyrone 0-06 - Round 2
The then All-Ireland champions were knocked out of the Sam Maguire race after a stunning second-half display from Laois saw them hold on for a prized three-point win at O'Moore Park.
Mick O'Dwyer's men made little of the wind and rain to send the injury-hit Red Hands packing. Despite Kevin Hughes' opening point, Laois fought back to lead 0-06 to 0-03 at the break.
Wind-assisted for the second half, the Red Hands were boosted by the introduction off the bench of 2005 Footballer of the Year Stephen O'Neill but points from Billy Sheehan (0-02) and Chris Conway saw Laois triumph.
The 70-year-old O'Dwyer, whose incredible inter-county management career continues for another game, said afterwards: "I'm very proud of the team. They were really outstanding in terrible conditions".
2010: Longford 1-12 Mayo 0-14 - Round 1
John O'Mahony quit as manager of the Mayo after his side were dumped out here. Three weeks earlier the Green and Red lost to Sligo in Connacht.
Alan Dillon had helped Mayo take a 0-07 to 0-04 interval lead but Paddy Dowd set up Longford substitute Paul Kelly for a galvanising goal and the dismissal of Keith Higgins left Mayo under all sorts of pressure.
After Alan Freeman had twice levelled for the visitors, Longford closed out a famous win with late points from Shane Mulligan and Sean McCormack.
RTÉ Sport's Siobhan Madigan reported that many of the senior Mayo players - Alan Dillon, Trevor Mortimer, Ronan McGarrity - left the dressing room in tears after the game and without speaking to the media.
John O'Mahony followed shortly after and said he had given it his all and that he had brought this team from transition to a team that he feels will eventually achieve.
2012: Antrim 0-11 Galway 0-10 - Round 2
Antrim pulled off a sensational one-point win over Galway at Casement Park to book their place in the next round.
Substitute Deaghlan O’Hagan’s injury-time point was all that separated the sides who had been level nine times during the contest.
Galway led 0-05 to 0-04 at half-time, but the McCann brothers, Michael and Tomas, scored 0-05 between them in the second half as the Saffrons edged their way to a famous victory.
The Tribesmen, who at that point had to go back to 2004 for their last qualifier win, thought they had done enough when substitute Padraic Joyce's free in the last minute of normal time put them a point ahead.
Antrim kept pressing, however, and Tomas McCann grabbed an equalizer in the first minute of injury-time before O’Hagan's brave effort a minute later booked a place in the third round draw.
2016: Monaghan 1-13 Longford 2-13 - Round 2
Longford have taken more more than a few scalps through the back door and they were at it again in 2016.
Goals from Mickey Quinn & Robbie Smyth set the midlanders on their way against a Farney outfit who were playing their third game in 14 days.
2018: Waterford 3-14 Wexford 1-18 - Round 1
A day to remember for the Waterford footballers as they move into the second round of the qualifiers pic.twitter.com/ryV7W79wvs
— RTÉ GAA (@RTEgaa) June 9, 2018
Waterford sprung a massive shock when they dumped south east neighbours Wexford at at sun-drenched Innovate Wexford Park.
Tom McGlinchey's men were full value for only their second-ever win in the backdoor competition and first since 2011 as goals from defender Shane Ryan, JJ Hutchinson and substitute Joe Allen powered the Deise past disjointed Wexford.
