George Clooney -- I'm Horny ... and It's Hysterical

George Clooney ... plus Stacy Keibler ... plus an air horn ... equals practical joke caught on tape ... and it's hilarious. Clooney was leaving his favorite L.A. Italian spot Dan Tana's last night ... when he totally set up our photog ... and then…

Maggie Grace Maggie Gyllenhaal Majandra Delfino Malia Jones