A Kick to the Bollocks

A policeman broke up a scuffle outside a pub.
"He started it!" said one man, infuriated.
"It's not my fault!" replied the other.
"Perhaps you could tell me what happened, Gents."
"He kicked me in the bollocks," accused the first man.
"I didn't mean to," replied the second. "How was I supposed to know you were about to turn around?"