Who would you...

let piss on your grave? Living / Dead / Real / Fictional people.

I would consider it an honour to have Gunnery Sgt. Hartman from Full Metal jacket take a leak on my tombstone, preferably whilst yelling "YOUR DAYS OF FINGER BANGING OL' MARY JANE ROTTEN CROTCH THROUGH HER PURDY PINK PANTIES, ARE OVER!".

Her Majesty The Queen could take a dump on my grave

I'm going to get cremated just to spite the bitch

Miss Universe, definitely. She can come and pee on me anytime

depends what they had for lunch

Miss Universe sans asparagus for lunch perhaps.