Just remembered one I don't think I've shared before.
Sold my property, which was located some 200 miles from where I live. Tenants vacated and we went up and shifted all the crap, which included a fair bit of drama (tenant did a flit but also thought I'd be up for storing all of her shit, finally agreed a date to collect it, so I put it outside in bags for her, and she didn't show... and then a friend of hers obviously saw us clearing it out and told her and she turned up screaming blue murder at us. Baffled... anyway)...
Property cleared, however in the messing and faffing, one of us left an old Henry vaccum and a bag of decorating stuff in the attached shed. Very obviously, not rubbish, not meant to be left.
It all completes and I get a shirty message from the buyer to shift my 'rubbish' or they'll charge me... fair enough, had forgotten those two items.
Had to send some friends round - when she got there, the shed was RAMMED with builders rubble in builders sacks, garden waste, all sorts of shit. She had a chat with the neighbour, and it turned out the buyer had got the keys from the EA for 'measuring up' before completion, and turned up in his work van to dump a load of shit... so he could threaten me into taking it, or make me pay to have it cleared!
Friend collected my bag of decorating stuff, my Henry hoover had vanished... fortunately the neighbour was kind enough to back me up that none of this crap was in fact mine and she'd seen it be delivered, which was very nice of her as I'd never actually met her! I told the buyer he could stick his little scam up his arse, and heard nothing more from him.