No real horror stories but me and a mate both got guitars for xmas back when we were at school aged 13. We were 'jamming' (I say that in the broadest possible meaning of the word) and I crouched down to turn up my amp - headstock hit the deck and took a big chunk out of it about the size of a fingernail. This was in the xmas holidays so the guitar was less than a week old.
Other than that, the closest was when I stupidly leant my LP against a chair on a wooden floor in a recording studio - obviously it went crashing to the floor soon as I steped away. Luckily no damage - that guitar is blessed, it's still my main squeeze.
I remember playing a gig and the other guitarist in the band had his giflfriend's Les Paul as a backup. Leant it against his amp and it went flying - headstock cracked off (ouch!). The guitar was a total POS but he got it repaired anyway and never told her. The repair cost £90 which was more than the guitar was worth. He's living with that lass now - wonder if he ever confessed (probably not knowing him, heh).
Oh, I've got one and it's a corker. Was lifting my Fender Tonemaster head out the boot of the car, the hardwired mains lead got caught in the boot lock and the amp was torn from my hands as I went to walk away. The amp hit the deck and the cab smashed open at the corner. I had to screw and glue it back together - not very pretty, but it got the job done.
:twisted: