ahh that sucks, i heard a story about a kid who was playing golf, he was teeing off and he swung funny and ended up twisting his testicles around each-other. im not sure if this is accually possible but the guy at the golf course told me. well he ended up havig to go to the hospital.
but seriously that has happened to me before, like it gets really tender ( i know that sounds gay). but it usually goes away. might still wanna get it checked out.