Time in a prisoner-of-war camp

3 prisoners of war - an Englander, an American and an Irishman are marched in to see the German commandant.

The commandant says, " I vill let you go if you say, "tick tock". Say "tick tock" and I vill let you go."

So the Englander says, "tick tock old chap", and the German says, "you may go"

The American says, "tick tock buddy", and the German says, "you may go".

The Irishman thinks to himself that this must be some form of trickery, so he says, "TICK", to which the German replies....

"Ve haf vays of making you TOCK!"