[while flying in a helicopter with Air Cavalry soldiers]

As they near the destination, several of the soldiers take 
off their helmets and sit on them.  The PBR crew reacts 
with surprise. 

CHEF
How come all you guys sit on your 
helmet?

SOLDIER
So we don't get our balls blown 
off.

Chef laughs, looks around.  Then he takes off his own helmet 
and sits on it.

Película: Apocalypse Now.