One day the teacher walked up to the blackboard and she noticed someone had written the word 'penis' in tiny small letters. She turned around, scanned the class looking for a guilty face. Finding none, she quickly erased it, and began her class.
The next day she walked into the room and again saw, in larger letters, the word 'penis' on the blackboard. Again, she looked around in vain for the culprit, but found none, so she erased the board and proceeded with the day's lesson.
Every morning, for about a week, as arrived at class she found the same word written on the board, only each day's word was larger than the previous day's word.
Finally, one morning she walked in, expecting to be greeted by the same word on the board, but instead, found: 'The more you rub it, the bigger it gets!'
Mr. & Mrs. Johnson are at the bank when an armed robber bursts in. Realizing he forgot his mask, the robber makes everyone lie face down and warns them not to look at him or he'll shoot.
Sure enough one stupid customer sneaks a look, and BAM! the robber shoots him on the spot. The robber then asks if anyone else had seen his face.
Johnson, continuing to gaze intently at the floor, shouts out "I think my wife got a glimpse."