It's not everyday you get the chance to get your name in the credits of a video game, but that's just what Croteam, Devolver Digital, cdv Software Entertainment AG, and Majesco Entertainment are offering fans of Serious Sam.

Fans are invited to enter the Serious Tweet Contest, giving them the chance to write their very own clever one-liner or hilarious wisecrack that Sam will drop right in the middle of the action in Serious Sam HD.

The lucky winner will have his or her line recorded by John J. Dick, the voice of Serious Sam, and integrated into the upcoming summer release of Serious Sam HD.

To take part fans should log onto Twitter and send a brilliant tweet quip to @devolverdigital between July 15 and July 30. Croteam will choose the winning line and Devolver Digital will announce it to all followers of and in early August.

In addition to having the winning line appear in Serious Sam HD, the winner's name will be immortalised in the credits of the game.

Serious Sam HD, a re-tooled and re-vamped high definition version of the classic FPS, is scheduled for release on Xbox LIVE Arcade and PC in late summer.