Sep 1 2008 06:46 AM I talked to my Japanese roomate, and he said that that joke about the dude's mom is childish. It's just a snipe shot that gets the dude's attention. A classic example is "Your mom wears combat boots." Who the hell cares if your mom wears combat boots? but it's a classic just the same. In my understanding, the funny part is that the dude gets so upset, after withstanding all those badass remarks about how "I'm gonna take your head, ****er" and the like.
Stupid Junko, learn how to make fun of dudes properly. Penis size, babe. That's the key.