Mercenaries 2: World in Flames Easter Egg - Chris "Rambo" Jacobs

First do Fiona's challenges till you unlock the camo outfit, then put it on, and Chris will say "When you're pushed, killing is as easy as ... er eating a hot dog or something" which is a reference to the Rambo movie where John Rambo says "When you're pushed, killing is as easy as breathing."

NOTE: if he doesn't say it the first time keep putting the outfit on