I've actually thought about this extensively. Here's a fun fact most people don't think about: when you get put in the ground, you're just renting. If no-one pays that rent again after anywhere between 25 and 100 years, your bones get dug up and thrown out or given to science or whatever crap and your gravestone is removed. For this reason, I have no intention of being put in the ground but I will rent out a plot for myself and a tombstone that reads something along the lines of:
"The Real Me"
"Birth Date - Death Date"
"These graves are solely for rent, your loved ones will eventually be dug up and trashed. LOL"
"I will not suffer this fate, as my ashes have been scattered over *haven't decided yet.* As a result, this grave is empty, so if you really want, come and bury your cat or something here in the dead of night. The Church probably won't appreciate that but I won't snitch. Anyway, my relatives are *insert living family members here* who are likely also dead by the time my lease has expired. When the lease expires, please give this gravestone to my closest living relative who also finds this funny (ideally, they will already be aware of this stone's existence.)"
"In the likely event that no family members want the stone, please give it to any museum that'll accept it and in the likely event that no museum wants it, send it to public auction. If the stone remains unpurchased, throw it into a river. Thanks."
I also think it'll be funny to record one of those video wills. I definitely wouldn't want to traumatize anyone but I'll definitely make reference to how my skin, muscle and bones were Hellishly destroyed and I'll probably make a few jokes at my grieving loved ones expense like "Listen Josh, I didn't raise no girl so you better not let out any tears." as I point at the camera. I really wanna put the "fun" in "funeral."