Percy Jackson & the Olympians: The Lightning Thief Easter Egg - Modern Warfare 2

When Grover, Annabeth and Percy are at Luke's place, he's playing video games. If you look closely, you notice he's playing Call of duty: Modern Warfare 2. Kevin McKidd plays Posiden in the movie, but is also the voice of one of the characters in the game, Capt. Soap Mctavish.