Anybody ever do this? (battery related)

[Red Rover]

Kept two 9v batteries (out of packaging) in the same pocket and then felt a burning sensation on my leg during rehearsal... reached in and found 2 VERY hot batteries. Oops!

[BassChuck]

I had one 9v in my pocket once that made contact with a coin and just about burned a hole in my pants. From that time I have a piece of tape across the terminals of spare batteries.

[Red Rover]

I also had my keys in the same pocket.