Adam Sandler walked onstage mid-interview and started a fight with...

“I saw the skid stains in your underwear.”
That is Late Night with Conan, 1995. Farley had just done Newt Gingrich in Congress. Then Sandler came out and the two of them turned the show into a lovers’ quarrel in front of everybody.
Conan lost the interview. The clip never came back.