Yeah, I was just nitpicking 'cause it is a dumb joke.
Actually, its not a bad joke, but it is so universal is loses it's charm.
It could have just as easily been a polish joke, a black joke, or any other ethnicity or person that one wants to ridicule.
Heres a good one;
Rickamaven and Tey decide to go fishing one day so they go to the local lake and rent a rowboat. They have an amazing day, catching fish like they are going out of style.
Towards the end of the day, Rick says, "Hey Tey, lets fish this same spot tommorow".
"OK, but how will we find this spot again??"
"We'll take this chalk, and draw an "X" on the bottom of the boat!"
"Rick, you fool!! How do you you know we'll be able to rent the same boat tommorrow??"
Man....I'm killing me.
:)