Z

1. The last letter of the English alphabet

2. A letter with two pronunciations. One British one not

American: it’s zee you fucking retarted piece of shit!

British: It’s zed you fockin’ dumb cunt! Get it right next time innit!

American: *cocks gun* sorry, I can’t hear you. Please speak into my microphone

British: If you kill me, then it’s zed

You get the point