Recently was cleaning a Gibson Les Paul...... set it against a chair for a second got up as I was getting up I saw the guitar spin and land just right for the head-stock to go flying off. Typical Les Paul injury. (Replaced with PRS McCarty 594 .... What A Les Paul should be built like)
Also owned a Tacoma Chieftain acoustic. Had to stop playing for a few years to let a wrist injury heal up correctly and forgot to pay attention to the guitar... string tension and humidity. Sure enough I open up the case and had huge issues. Cracks down the front and almost all braces were loose. Would have cost more to repair than the guitar would ever be worth. (Replaced with a Taylor 612CE First Edition and a Taylor 816CE)
Had one of the first Ibanez RG550's. Was out playing at a friends house with no strap locks on and down she went and off went the neck. Broke the neck and snapped the neck pocket. Never again did I play without strap locks. (Replaced with 1988 ESP Horizon Custom)