The cast of The Big Bang Theory appeared on TBS’ Conan on Wednesday, Feb. 24 to celebrate their 200th episode, and Mayim Bialik and Johnny Galecki redid their teenage kiss which first occurred on Blossom back in the ‘90s.

When host Conan O’Brien asked the two about the 1991 kiss, they said it was both their first “stage kiss,” but Bialik also recalls it likely being her first kiss in general at age 14.

After a photo of the kiss was shown, they were pressured to redo it. And much to the audience’s surprise, they agreed after some hesitation at first.