David Gilmour was a founding member of Joker's Wild.

Yes, David Gilmour helped start Joker’s Wild in the early 1960s, before he joined Pink Floyd. The band was formed in Cambridge with Gilmour on guitar and vocals, playing covers and originals at local dances. He left in 1967 when Pink Floyd came calling after Syd Barrett’s departure.

So next time someone asks, you can skip the trivia hunt. Gilmour’s pre-Floyd days included Joker’s Wild, along with a later band called Bullitt.