This one is one of my favourites, as it isn't racist, the humour does not have anything to do with race, but is really funny..
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We are at the Second World War and 2 German soldiers are chasing a Jew to kill him. The Jew runs and he runs, till he sees an empty well and jumps in to save himself. Upon reaching the well, the Germans stand around it and start to ponder:
1st German: Where the hell did that jew go?
Jew (mimicing the echo): Where the hell did that jew go?
1st German: Do you think he went into the shrubs?
Jew: You think he went into the shrubs?
2nd German: Meh, I don't think so!
Jew: Meh, I don't think so!
1st German: You think he went up to the mountain?
Jew: You think he went up to the mountain?
2nd German: Meh, I don't think so!
Jew: Meh, I don't think so!
1st German: You think he went into the well?
Jew: You think he went into the forest?