"Special Games" 

A special Swimming tournament that is about to take place. For the tournament, the participants include a guy without arms, one without legs, one with just a torso, and... just a head. 

Starting pistol goes off, everyone goes forward, but the head sinks right away. 

After the event, reporters ask: What did you count on?

"Well, see," the head says, "I've spent seven years in training to use my ears... but those idiots put a swimming cap on them."