Actor David Hasselhoff struggled with two of his co-stars on the set of new movie Piranha 3DD - one he couldn't stand and the other he refused to be in the same room with.

The former Baywatch star, who plays himself in the fishy sequel, only signed on for the movie if producers could keep him and Gary Busey apart during filming.

He says, "I run from him. I made a pact in my contract I wouldn't have to be in the same room as Gary Busey. He's really an entertaining person, but he's a little scary."

And there was another young star who Hasselhoff hated working with - because he couldn't pronounce piranha correctly.

The TV icon explains, "There's a little ginger moron in this movie... this little red-head kid, and he kept saying 'Pir-anna', and it's 'Piranha,' and it was driving me nuts. The good thing at the end of the movie... the piranhas get the kid."