If you spit in his face you leave DNA!! Far easier to throw some Ragwort in his garden or other shitty plant seeds. Get his address & arrange for double glazing salesmen to call kitchen salesmen local Jehovah nutters, Skips.place ad in loval paper for an open house coffee morning Place an ad in local free papers for a house clearance put his obituary in local paper etc etc etc. And while all this is going on keep walking past Smiling at him ? Atb