Two guys are in a bar, a small one and a big one. The small one says to the big one:
"Hey, wanna hear a Polish joke?"

"Sure," says the big, strong guy, "but I'll have you know I'm Polish.

And so are they." The big motions toward two even bigger guys, who come over to the table.
"They are my brothers."

One of the two brothers motions toward a bunch of other big Polish people who come over and introduce themselves as the cousins of the brothers of the big Polish guy.

In the end there, are about 20 HUGE Polish guys on the other side of the bar.

"So, so you STILL wanna tell that joke?" asks the big Polish guy.

"No," replies the small guy.

"Why not?" asks the big polish guy, "scared?"

"No," replies the small guy, "I just don't feel like explaining it 20 times."