There actually is a web site that anonymously sends horse poop to the victim of your choice for rather cheaply (only $16.95!)

Here it is for those who are interested: Shitexpress · Send **** in a box to someone, stay anonymous, pay with Bitcoin/PayPal

If my mother wasn't dead, I would do the same thing.

Maybe I will plan a trip to her grave site and take a big wiz on it instead