In the originall Star Trek series, in the episode"The Trouble With Tribbles" there is a scene where Shatner opens a storage door only to be buried up to his neck in the little things.
The crew, just like the cast, didn't like Shatner, so they took the opportunity to keep chucking Tribbles at his head when he gets buried. Even when it should have long ceased, they still keep throwing the props at his head while Kirk is supposed to be talking. You can see Shatner break character and give the off camera crew a very dirty look in the episode.