I save the stickers from my fruits and vegetables.
I save all of the stickers that are attached to fruits and vegetables that I consume. I usually stick them to my refrigerator if I'm at home, or to my laptop's docking station if I'm at work. When I was a kid, I stuck them to my mirror. I don't do anything with them, but I never throw them away, either. I don't know anyone else that does this.