He is right it is a very old joke.

Here's a good one that wasn't even intended.
My girlfriend got me a plush M&M for Christmas, put it in a tampon box and wrapped it. I obviously was shocked when I unwrapped my gift at school in front of all my friends and was holding a tampon box.
It doesn't end there. After I opened the box and got my gift, my friends started tossing the box around and it landed near the bottom of the stairs. We sat there watching people's reaction to the box. Not a single person would go near it. They would skip the step. Some would just turn around and go the other way. Even after a teacher threw the box away, no one would use the staircase for the rest of the day.