The thrifty actor lives two hours drive from Los Angeles, so when he's shooting hit TV series The United States of Tara with Toni Collette five days a week, he chooses to save cash on gas and accommodation by sleeping on the lot.
The My Big Fat Greek Wedding star says, "I'm not gonna drive home every night and I don't wanna spend more dough (money) on an apartment, because I already have a mortgage.
"So I said to the guys when they gave us a little dressing room, I said, 'I notice there's a little empty dressing room over there; any chance you could throw a futon and a TV in there.'
"So I sleep for five nights outta the week... in an office on the lot... I park my car on the lot and I go up on Ventura Boulevard after we finish around nine or 10 at night, have a few beers and then I stumble back through that old studio."
But Corbett fears going public with his sleeping arrangements could cause a few problems - because actors and crew members are forbidden from spending the night on the lot.
He adds, "You're not allowed to sleep there... All the guards, they think I'm a writer on the show... and I'll come back at two in the morning: 'Hey boys!' They'll say, 'You're here late; you gonna work all night?' and I go, 'Write all night long.'
"It's a really cool vibe... I've got a nice shower in there, I've got the cable. I've got everything I need."