John C. Reilly said he was treated different when he wore a fat suit!

JOHN C. REILLY wore a fat suit and facial prosthetics to play old-school comedian OLIVER HARDY in the upcoming movie "Stan & Ollie".

Sometimes, Reilly would take breaks while still wearing the makeup and the fat suit, and he noticed a real difference in how he was treated by people who didn't know he was an actor in costume.

He says, quote, "It didn't feel good, I must say.  Someone walking by, typically [they would look away] as if they didn't want to see you.  Like, 'Oh, it's quite sad.  I'll embarrass him if I look at him too much.'

"So you end up feeling like, 'Hey, I'm a human being!  I'm here, you know!'"