I have three lady cats, all spayed, more indoor cats than out (we do NOT have a catflap). Next door has an un-neutered tomcat who gets into our house anyway possible (even through the tiniest gap in the window) and sprays everywhere. There is a tomcat from a few doors down who does the same. Our house constantly reeks of tomcat, and as we only moved in last year, I REALLY resent our new carpets being used as a toilet by someone elses pet.
These tomcats also drove away our (neutered) tom by constantly breaking into our house at stupid o'clock and beating him up.
I have tried mentioning to next door that their cat is breaking in and weeing, indeed, she even caught him squeezing into ours through a high window once. She thought both things were funny.
I have to mention that we moved after 13 years in a flat partially due to a stalkery neighbour who made Janine Butcher look reasonable, so due to that (I've ended up on anti-depressants because of it), anything negatively neighboury kind of stresses me out far more than is normal. DH thinks I should chill. I think next door's cat should be boiled in oil and served as an entree. (Although I actually feel sorry for him - it's unkind to keep him entire)
But AIBU to want to post the contents of my cats' litter tray to the neighbours in thanks for their cat's kind contributions? 