George Clooney & Rande Gerber's Party with Famous Trans-Am and Tequila!

George Clooney and Rande Gerber just raised the bar for office parties by throwing a tequila-soaked bash -- with the most awesome movie car thrown in for good measure.

The famous buddies looked like extremely hot moonshiners Thursday in L.A. ... as they loaded up the Trans Am from "Smokey and the Bandit" with 20 cases of their Casamigos tequila.

We're told they were wrapping a commercial shoot, and wanted to treat the cast and crew of about 100 to a little fiesta. The Trans Am, reportedly worth $550k, wasn't just for the surprise ... we're told it was part of the commercial.

Yup ... we wanna be them, and so do you.

Bandit ballers!