There was a great story told in Dave and Patti Campbell's book of busking anecdotes, which was set about the time of "Jaws".

A US busker/magician was performing at a cinema queue outside "Jaws". He filled a tube with stage blood and threaded it through his jacket sleeve, leading into a fake hand at the end. During his show, he plonked his "hand" on the table and whipped out a meat cleaver with the other, with which he severed the "hand" on the table. By all accounts he had to scarper pretty quickly to avoid getting lynched!