Matt Damon says he often gets mistaken for actor Mark Wahlberg.
The "Elysium" star said that he has spoken to Wahlberg, who is often faced with the same problem, reported Digital Spy.
"I've talked to Mark about this because he gets people (that) come up and say, 'I love you in The Bourne Identity'. So Mark and I have a deal. If we're mistaken for one another, we have to be as polite as possible," he said.
Damon, 42, said that the strict diet he adopted for "Elysium" made him grumpy.
"I was grumpy on this set, because I was on a diet for the whole movie. I think I shut up a little bit and keep to myself (when I diet)," he added.
