If you find yourself in the back of a Crown Vic, you can see how long it takes for the cops to notice your arms are crossed across your chest. Actually, don't do that. You don't want to scare anyone. Be careful with these keys.
Ethan Wolff-Mann is the Gear editor of Supercomrpessor. He advises you to use these keys with care. Follow him on Twitter @ewolffmann.