>> I suspect Bugs Bunny put his finger in the end of the barrel.
There was a Mythbusters show on that, too. Ha! Awesome ballistic-gel-fabricated-hand mutilation ensued. Sealing the barrel with cement gets a good banana-peel-like failure of a shotgun barrel, though.
SnakeDoc
That movie Support Your Local Sheriff scene where James
Garner stuck his finger in Walter Brennens six-shooter was
pretty funny too