Needs 20 participants or more. Make two teams. Elect one from each team to be the surfer. Have everyone else on the team lay down right next to each other perpendicular to the direction which the mattress will travel. Have the surfer get on the mattress, which is placed on the first few players laying down. Everyone laying now roles until the mattress travels over him. He then gets up and runs to the front of the line and continues rolling. The team whose mattress surfer reaches the finish line first wins.