Last night on Conan, Mayim Bialik and Johnny Galecki recreated an awkward kiss from the 90s sitcom Blossom. They were on the Conan along with the rest of the cast from the Big Bang Theory, when Conan brought up that kiss from long ago. And it was indeed a long, long time ago, as evidenced by their early 90s attire and gangly teenage bodies.

But they only agreed to recreate that kiss on the condition that everyone else on the cast (shamelessly) kissed someone, too: