Some good one's here ^
Basically anything involving a car I am starting to consider a regret.
Cheap cav sri off ebay (few hundred quid) went down to other side of weston super mare. Car was rough as hell but I only wanted the engine for a swap. Oil light was on around 5 miles from home, drove quite a lot of the way home with reports from my father of smoke when under load. Got fed up of the heap on the way and thought lets see what it will do, got up to 120 plus and all the dash lights come on as it cuts out and sticks me on the hard shoulder. We ended up having to go home to get a tow bar and come back for it as we couldn't cut a belt to use as a make shift tow rope. Got it home and it damn well started, would tick over and rev but above around 2k sounded like a brick in a tumble dryer. Stripped off the small amount of good stuff and scrapped the heap.
Bought a r reg clio 1.2 for my ex to learn to drive in, she cheated on me, so that went to a mate without her knowing.
Went with a mate to pick up a nova that was heavily modded, stripped out, big wheels, digi dash etc. Drove home fine. Next day cut out at a junction and caught fire so that was a waste of money.