Okay, So Just Admit It...

What's the strangest/funniest thing that's ever happened to you during "the act"?

I'll go first.

A long time ago, I was engaged in the act with a girlfriend, when all the sudden I feel a licking in my rear.

Thinking "Wow! My girlfriend's the greatest! She brought a friend along to toss salad!", I turn around to see it's her damn dog...