My mom has a friend who put her name on the contact list for meals on wheels when she turned 40. Apparently that happened a lot. They thought it was as funny as he did.
When I was in high school we would regularly write the chemistry teacher's name and phone number on all the military recruiter lists. Just trying to get rid of him.
That reminded me of something I had forgotten about. Years ago (before Viagra) I started finding ads for help with "male problems" in my mail box. They would always show an old guy with a young sweet thing and imply that it could happen to you if you bought their product. I was single at the time, had several girlfriends and was puzzled to say the least. It turned out my step-dad was being sent this junk mail and Mom was putting it in new envelopes and sending it to me as a joke!!
My Mom elevated practical jokes to the level of an art form. That’s just one of many good ones she got me with. She's been gone many years now and I really miss her.