Someone that didn't take it out in time.
Because walking wouldn't burn enough calories.
To burn some calories.
Jane: I can't answer. I didn't know I was supposed to keep count!
Jim Jones, I heard he took out 909 people with one punch.
Some idiot forgot to pull it out in time.
Some douchebag forgot to pull it out in time.
You can unscrew a lightbulb.