This reminded me of what is probably just an urban myth but none the less quite funny. Sadly I don't think it would have worked for you Ian as It wouldn't translate to Spanish...

A young woman was pulled over in Austin, Texas, for speeding.
As the Texas State Trooper approached her car flipping open his ticket book, she said “I bet you’re going to sell me a ticket to the Texas State Police Ball.”

He replied, “The Texas State Police don’t have balls.”

There was a moment of awkward silence as she smiled and he realized what he’d just said. He then closed his ticket book, got back into his patrol car and drove off.