Here’s one I ran across in the last issue of the American Rifleman mag.  I thought it interesting so I am passing along to you:

This was run in January of 1950, but could still apply today- Watch out for Strong Tobacco-
“I have learned that it is a mistake to carry a loose .22 caliber cartridge in the same pocket with my pipe.  The cartridge apparently found its way into the bowl of the pipe, which I then loaded with tobacco, a form of double loading that is not too good. (:-))  The explosion that followed a few moments after I lighted the pipe was loud and, needless to say, unexpected.  The burst cartridge case was found, but not the bullet.  No one was hurt.”

The following is a photograph of the actual pipe:

Strong Tobacco