I guess I am the guilty one of pulling pranks at Christmas!
I was blessed with a SIL that made most of her clothes. There was a certain knit top that she liked to wear. One year I managed to get a scrap of fabric that she was using to make a skirt and jacket for herself. I went to one of her favorite stores and purchased the knit top that she wore in the color matching the fabric sample I had gotten. She has been notorious for taking gifts back. When I found out she had taken the top back, I vowed that from then on I would only get her something she could not return. From then on for her birthday and Christmas she recieved stationary and stamps. I figured that she would feel a little silly taking the stamps back to the post office.
I also had a niece that was always bored with our Christmas with my parents. So one year My Dad and I took and $1.00 bills wrapped them around the tiniest drill bit we could find and then wrapped the dollar bill around it and then put it in a clear drinking straw and then cut the straw off at the length of the dollar bill. Mixed them with shredded paper and wrapped them loose in a big TV box. There were 50 of them and we would not let her quit until she found them.
Needless to say she never forgot that Christmas.