Batteries touch metal chassis and cause sparks?

A gentleman posted a thread on a different board awhile ago, with a picture of his jacket pocket; he had stuck a sidexside pack in there, and forgot he had some loose change in the pocket too!
The sparks started a nice little smokin' blaze that burned a hole clear through both sides of his jacket/lining!

Pretty sure he started wrapping elec. tape around the ends of his sidexside packs after that. :002: