One bitterly cold winter’s day, a policeman on patrol came across a motorcyclist who was swathed in protective clothing and helmet, stalled by the side of the road.
"What’s the matter?", asked the policeman.
"Carburettor’s frozen", came the terse reply.
"Piss on it. That’ll thaw it out".
"OK. Watch and I’ll show you".
The constable lubricated the carburettor, as promised. The bike started and the rider rode off waving.
A few days later, the chief constable received a note of thanks from the father of the motorbike rider. It began, "On behalf of my daughter who was recently stranded…".