Blue lights - sickening feeling in your stomach. Policeman gets out and walks up to your car - very slowly to build the tension. "Ok so wheres the fire son?"

. Policeman leans through your window "Did you know you were doing 36 in a 30 zone?"

.
I don't know about you but I'm never any good at thinking up witty replies in these sorts of situations so I was hoping you could provide me with a repository of amusing quips or excuses that would get me off a ticket.
(I'm not condoning the excessive speeding in the example above and we will just assume that the above drivers concentration wained
- hey that's me a little and the speed crept up without him or her realising

.)