Every once in awhile, when a customer has been horrible and then has me hold or store merchandise for them, I might rub it on my butt. Over the pants, on the cheeks, like what a chair sees when you approach. I get giggles thinking about how much this amuses me. Then, when I hand it to the customer later, I think "I rubbed that on my butt."
Immature, perhaps, but I don't care!