bilingual jokes

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I've begun leading an English conversation group at the American Information Center here in Ekaterinburg. Next meeting we are going to talk about humor, and it's been suggested I take some examples of bilingual jokes. Unfortunately, I don't know a lot of them. If anybody knows any, I would appreciate some help!

Here's an example of what I'm talking about:

A Russian tourist in London has decided he wants to see more of the UK. He goes to the bus station and at the ticket window says, "Two tickets to Dublin." The cashier, also a recent Russian immigrant, replies, "Куда, блин?" And the tourist says, "Туда, блин!"

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hi guys.

i know this has probably been asked a bajillion times, but i simply can't understand it: the cases.

no matter how much effort i put into learning them, i can't do it. i never know which one to use in which situations and it's so frustrating. i've researched them a lot, but i think i'm just dumb.

can someone please explain them to me?

thanks in advance.