Conan O’Brien injured his head while taping a stunt for The Tonight Show on Friday.

A rep for NBC tells The Associated Press Conan hit his head doing a stunt. He was examined at a hospital and released — but not before cracking a few jokes about the mishap.

“Last thing I remember I was enjoying the play with Mrs. Lincoln, and the next thing I knew I was in bed being served cookies and juice,” Conan joked afterward.

A rerun of The Tonight Show, featuring actor Jeremy Piven, aired Friday.