A gopher
Had some dirt work done when we built a house. Was in the process of paying the man $500 for his day's work when a gopher pushed up a mound 60 yards out. Politely paused the payment, stepped indoors and grabbed the first gun I could lay hands on, a Rem .22 speedmaster with iron sights. Jacked one round in, leaned in on the garage door frame, held high and hit the gas. The dirt was just starting to move, came through the dirt mound and clipped Mr Gopher in the top of the head, rolling him out of the burrow. Checked the gun to make sure the chamber was clear, set the rifle on the pickup tailgate, turned back to the gentleman and asked him, Where were we?" His response was classic. "We are all done, and I was just leaving...."