For no apparent reason, a circuit went out this afternoon in the garage. Not a big deal since it primarily affects the Xmas lights. But can't figure out the source of the problem. Fuse wasn't tripped at the box, resetting didn't help, no load on the circuit at the time. WTF? I'll check all the extension cords in the morning to see if a deer stepped on one. Could that kill a circuit without tripping the fuse?