I have two for you; one of which, I may already have mentioned elsewhere.

Couple go on honeymoon, stupidly leaving the keys of their new home with a "friend". Said "friend" lets himself in, puts the plug in the bath, empties therein two or three packets of jelly and turns on the hot tap.
When the bath is full, he turns off the tap and leaves.
How do you get rid of a bath of jelly? And, no, I don't know what flavour, though blackcurrant would have stained the bath, big time.

My grandfather was born in 1886 and grew up in Sussex.
One of his favourite tricks was to go house to house along a terrace, and tie thread from one door knocker to the next.
He would then knock on the first door and leg it. Each door being opened, pulled the thread tied to next door's knocker. It had the potential to enrage an entire street (or one side of it).