Njord wrote:

Hmm, replying to my own post. But wondering if this has anything to do with
the expression 'to pull the pin'?

"Once you pull the pin, Mister Hand Grenade is no longer your friend. "

-- The sergeant who had the thankless task of instructing me, and a whole
bunch
of other Hospital Corpsmen, on throwing hand grenades to cause injury to the
other side.

--Dale