The Bob Hope USO shows were always a mystery to me...

[Adenoid_Hynkel]

18. Milton Berle used to do the crashing the show bit

Say what you will about him - he had a difficult reputation, but at least the guy could ad lib or, as he would admit, have enough one liners memorized that he could engage a host.

Thought I'm reminded Conan telling the story of how, in his last years, Berle crashed "Late Night" on NBC.
He ran around the stage, hamming it up to each camera, went into the audience, etc.
The crew kept trying to interrupt to get get a word in, but he stubbornly wouldn't have it. When he was done, he dashed out the door...and never found out the crew was trying to tell him the show was in commercial, that nothing was being recorded at the moment and they were trying to get him to stay for the actual taping.