Among other emotions you could bottle the frustration that both Leinster and Ulster will try to work out at the Aviva Stadium this evening.
In Ulster's case, it's pretty obvious. No European silverware to shout about since their 1999 final success at the same venue, and just the PRO14 title earned seven years later to embellish the trophy cabinet.
Their loss to Leinster in the Twickenham decider three years later is part of a litany of what might have been for the province.
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Leinster have had their fair share of it, too, despite their status as Europe's second most successful teams.
That the Blues have won just one Champions Cup since that 2012 victory is something that animates head coach Leo Cullen, who was there as a player or a coach for all four of their titles.
"There's always that sense particularly when you get to a final, that's what makes the beauty of the competition," he said.
"That's what drives us day in and day out - it is so bloody hard to win."
Last year's final defeat to La Rochelle in Marseilles was their second taste of failure at the last hurdle since their last triumph in 2018.
"Jeepers, if you think back to Marseilles, the game is there in our grasp and there are things in our control that we could've done better," reflected Cullen ahead of this sell-out last 16 tie.
"You live with some of that afterwards and, for younger players, you try to get across to them how hard it is to win.
"You think back to 2012, you're probably thinking, 'we're going to go again, 2013' - but then other teams come to the fore.
"There are teams who are desperate to win it as well. Saracens and Toulon were so dominant in the seven, eight year period."
Cullen recalls the 2019 decider against Saracens, when Leinster had the chance to take the lead early in the second half but faded in the last quarter.
"It's still the big moments on the big days, that's the difference between the winners and losers," he stated.
"The winners lift the trophy and control the story in many ways.
"There's always that frustration, everyone wants mire. There are so many teams desperate to be successful.
"Jeepers, you think back to after 2012 - there was a six or seven year period where we wondered if we'd ever be competitive in the competition again.
"I think back to sitting here after we'd lost to Toulon. They were at the height of their powers then."
Cullen adds that the addition of the four South African clubs this year makes it an even tougher prospect to win - on top of the demanding four game, two pool structure.
"Everyone's got a different challenge, but the tournament's never been harder to win in many ways," Cullen stressed.
"That's what makes it incredibly special. Are we still as hungry as ever? Yes.
"The memory of how last season ended is still very fresh for us. We want to get back to that stage.
"But, you can't think too far ahead, it's just about Ulster. That's been the focus for 10 weeks now.
"The Irish guys have been away, but it's been at the back of their mind as well because our last game together was against Racing, here, and we talked about getting back here again.
"Here we are. Now it's about delivering on the big day."
LEINSTER: Keenan, Larmour, O'Brien, Henshaw, Lowe, R Byrne, Gibson-Park; Porter, Sheehan, Furlong, Molony, Ryan, Baird, van der Flier, Conan.
Replacements: McKee, Healy, Al'alatoa, Jenkins, Penny, McGrath, H Byrne, Frawley.
ULSTER: Lowry, Baloucoune, Hume, McCloskey, Stockdale, Burns, Doak; Sutherland, Herring, O’Toole, O’Connor, Treadwell, McCann, Timoney, Vermeulen.
Replacements: Stewart, O’Sullivan, Toomaga-Allen, Sheridan, Rea, Cooney, Moore, Moxham.
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