I dont check my luggage in for a number of reasons- one of which is avoiding having it damaged by the airlines.
Yesterday, a gentleman was trying to get what was a very heavy and large bag into the aeroplane locker near me.
It went in with a very loud bang.
When I was getting off the plane, I discovered that he must have been shoving his bag in top of mine. It was so heavy it distorted my bag and broke the handle off.

Thank you fellow passenger!

Bag handle without bag