Red-shelled koopas, as seen in Super Mario Bros., who are safety-conscious, and won't walk of ledges.
"Watch out for that koopa, up on that ledge!"
"It's okay, Alex. Safety koopas don't jump off ledges."
Type your email address below to get our free Urban Word of the Day every morning!
Emails are sent from email@example.com. We'll never spam you.