Jeopardy! may be amongst the toughest and most venerated game shows of all time , but you can’t accuse it of never having any fun. Alex Trebek was even known to wear costumes at times to deliver clues, but on one day in particular, he went in the opposite direction and took the stage wearing no pants . Current host Ken Jennings rewatched that iconic moment and gave some fantastic context to what inspired Trebek’s bold prank.

The game in question occurred in 2005 during the taping of the Ultimate Tournament of Champions, with Ken Jennings, Brad Rutter and Jerome Vered competing. The current host took a trip down memory lane recently and seemed almost as surprised to see a bottomless Alex Trebek as he must have been that day 20 years ago. Check out Jeopardy! ’s video on Inst

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