You're favorite Big Bang Theory slogan is now you're favorite Keychain. Whenever you feel the need to smack down a conversation with a whopping "Bazinga", go for it! Just pull out your Keychain and let them have it. You'll "Bazinga" when you're driving, when you open your front door, when you drop your keys, when you lose your keys and of course when you find them. Show everyone you're n actual scientist, and they're not. You are one, right?