My laughter is based on three things:
1) They're effeminate, as someone said above. Asian men dressed up as women look like women, and that's a little weird to me.
2) Unlike Mexicans who own restaurants in America, Asians usually answer their own phones rather than hiring native English-speakers. This means every time I order Asian take-out I have to fight to get my order across "creary".
3) Chinese people eat dogs. There isn't a single other food in the world that bothers me like that does. It's a dog. You just don't eat it. That's me, the ignorant American speaking, but I can't help it. I remember when I first found out that that wasn't just a joke. A friend of mine married a Chinese woman, and she once told us that her dad gave her advice when she left home: "Don't tell them you've eaten dog. They think it's weird."
I'm smart enough to know that not everyone fits stereotypes, and I'm also smart enough to know that some people do. I don't have a PROBLEM with Asian people, but they are pretty hilarious.
And please don't hate the messenger. I don't have a problem with Asian people, I'm just letting you know the stereotypes that are many times accurate and always hilarious.