Through all the doom, gloom, and his sibling's deaths in the Game of Thrones finale, Tyrion Lannister (Peter Dinklage) was still able to squeeze in a few jokes while trying to rebuild Westeros from scratch. During his final moments of the episode, as he sits around trying to get things done with the new Small Council, Tyrion makes a joke about a brothel and "honeycomb and a jackass." The joke gets no laughs from his present company, but maybe it's because it's not the first time Tyrion has attempted, and failed, to make the joke over the last eight seasons.
Between everything else happening in the Seven Kingdoms, Game of Thrones managed to give Tyrion a long-running, no-punchline joke for the series.
The first time he tries to tell it is actually way back in Season 1, when he's being held prisoner by Lysa Arryn (Kate Dickie). Lysa demands that he try and explain his actions, and instead Tyrion launches into a crude story about all the bad things he's done in his life. Just as he's about to launch into the honeycomb and jackass part of his story, he's cut off by Lysa demanding his silence.
The second time we hear Tyrion try to tell this joke is when he's sitting around with Grey Worm (Jacob Anderson) and Missandei (Nathalie Emmanuel) in Meereen, trying to get them to tell jokes -- and also laugh at his. After Missandei and Grey Worm both successfully tell jokes, Tyrion sees this as his opportunity to once again attempt the honeycomb and jackass one. However, he's cut off by the arrival of the fleet sent by the Masters to attack the city.
The series finale serves as the third attempt at the joke, and once again, Tyrion is cut off before we can hear the punchline. Knowing Tyrion, it's probably very dirty. And now that the series is over, we're never going to hear the punchline, but Reddit has come up with its own ending, which is a variation of the "12-inch pianist" joke -- which would probably be Tyrion-approved. May the new Hand of the King spend the rest of his days in King's Landing still trying, and failing, to get the full joke out.