When I was in the student council in high school, one of my jobs was to publicize school events by putting announcements on the marquee (is that the right spelling?) out in front of the school. On one occasion, with the help of a friend, we put "something on the marquee," on the marquee. I think a total of three people got the joke.
Speaking of things from the past, I just found a bunch of old files from my high school teaching filing cabinet. I used to keep records of the hilarious or ridiculous things students would write or say. Here's a few samples:
"After the bomb was dropped, Japan understood that we were very mad."
Yes, using atomic weapons is a very good way to demonstrate anger. People really know how you feel when you do that.
"Adolph Hitler killed himself by committing suicide."
Personally, I've always found committing suicide to be one of the best methods of killing yourself.
One student was able to morph Ike Eisenhower with Albert Einstein in a clever way by saying "Albert Eisenhower was one of the smartest presidents we ever had," ... or words very similar to this. Man, I miss teaching.