I've decided to freak out a work colleague by randomly yet constantly sending him packets of chipsticks. I'm easily amused.
Last year I sent some peanuts in their shells to a former work colleague in Latvia but I never heard back. We had a peanut joke going on from around 2002. I got a big bag of them at Hallowe'en back then but got bored with eating them and so used to leave them everywhere around his desk and made videos of them and send them to him. I left a pile along a shelf in the office and ages later one of the new dedicated Hungarian cleaners polished the shelf, carefully picking up each peanut and placing them back again after the polish.