This sounds a little far-fetched, but I would LOVE for it to be true:

The "National Enquirer" says Steve Carell went to a Hollywood pizza joint to pick up an order, and saw that the boss was all by himself and totally stressed because an employee never showed up.

So Carell, quote, "jumped behind the counter, donned an apron and began answering the phone, taking orders from hungry patrons."  He worked for about 45 minutes, until the guy got caught up.  As a reward, he got his pizza for free.

This sounds like something one of Steve Carell's characters might do, but who knows if he's that cool in real life.  I have decided that until someone proves it false, I'm going to believe it.