So, neighbour knocks on the door asking if he can come in and trip his hedge. Fine. He goes away to collect his gear and comes back 10 mins later.
He then proceeds to spend some time in my garden smoking a fag and treading it out on my lawn.
So I went down there when he'd gone, found the fag end and threw it over the hedge into his immaculately kept garden in a petulant, childish fashion.