Using the auto-shoot feature by holding the trigger and bouncing the gun, putting a crate together. Working on one knee, putting a row of staples in the bottom of the crate. Set the gun down on the other side of the crate, on my foot, without letting go of the trigger.
Limped, bleeding, into the bosses office to get a pliers to pull the 2"staple out of the shoe, so I could get my foot out.
Really, got very lucky. Bracketed my middle toe, bled on both sides, but a half inch either way, would have busted two toes.
Funny as he'll, looking back on it.....not hilarious at the time.