It's a pretty old joke, Hope. Must be recycling time.
When I was in the Navy years ago, people started calling me Ollie and it stuck. So, I engraved OLLIE on all my tools, so I could retrieve the pilfered ones.
One day I was asked, "Hey Ollie, why did you put 31770 on all your tools?" Not thinking it was actually a serious question. I told him it was because I stand on my head to fix things. He didn't get the joke.

And, I decided to leave him in suspense. Gotta learn to think SOME time your life.
Cheers,