A man was driving when a traffic camera flashed. He thought his
picture was taken for exceeding the speed limit, even though he
knew he was not speeding. Just to be sure, he went around the block
and passed the same spot, driving even more slowly, but again the
camera flashed. He thought this was quite funny, so he slowed down
even further as he drove past the area, but the traffic camera
flashed yet again. He tried a fourth time with the same result. The
fifth time he was laughing when the camera flashed as he rolled
past at a snail's pace.
Two weeks later, he got five traffic fine letters in the mail
for driving without a seat belt.
http://www.sgforums.com/forums/2223/topics/365824
This joke is just on the 3rd page.