Asians being great at math is another.
In my experience, there are some strong foundations for as to why that stereotype exists.
In high school, I participated in some science contest. It was semi-rigged, in that you were guaranteed not to have covered all the material on the test, though I got lucky by skimming the rest of the textbook the morning of—[spoili] The test was organized like this. You had to be below a certain grade, for fairness sake, and they covered everything up until the end of that grade's expectation. (The province sets out guidelines for each grade, and there are standard textbooks.) However, the test was given out two-thirds through the year, so any given class only knew two-thirds of the material. Which two-thirds they knew varied, because different teachers teach material in different orders.
My class was particularly unlucky; the test focused mostly on radiation, with a little bit of chemistry, geology, and biology. We had only studied bio and chem at that point.
I however, read the chapter on radiation as I was on my way to school the morning of the test, and thus left the rest of my class in the dust[/spoili]. My asian friend, because he's sort of a yellow-supremacist, went and showed us a list of the hundred or so kids who had made it into the top whatever percent. All of them had asian last names. Year before that? Same. And again. And again.
It can be a little discouraging, no?