I got a speeding ticket today and did not realize I was speeding. The look on the policeman's face though, was as if I robbed a bank !
Wow, how fast were you going?
I was going 44 in a 30.  I was late for work, and I guess it just slipped my mind. 
That can happen to anyone though. It was speeding, but at least it wasn't wreckless driving!