Recently, my son attended a wrestling camp. My friend, Lefty, asked if it was pro wrestling or amateur. Good question.
We looked around, and it seemed we found a foreign object under the mat:
Sadly, it was only a water bottle.
Then we found a chain that could be used as a foreign object.
Later, in a match, my boy was able to procure the chain from its hiding place in his pants. He slugged his opponent with it while the ref wasn't looking, and that enabled him to score the pin.
In all seriousness though, he had a blast at Wilson Central High School's wrestling camp. Coach Kramer showed them some good basics and the boys (and one girl) learned a lot!