I painted my computer black trying to make it run faster but now it doesn't work.
That is kind of weird is this a racist joke?
Not really, don't you know that black people run faster than everyone else.
Even if it is done as a joke, perpetuating stereotypes that black people do not work and can run fast isn't right. You only need to see the success of people like Barack Obama and Colin Powell to understand that black people can work just as hard as any other race. Instead of making jokes about racial stereotypes try instead to be more positive so that you do not inadvertently hurt and offend anyone.
I see Blacks as being faster because they are always running from the cops. Just the other day one was running away from somebody after trying to steal their purse.
You can't try to justify your racism behind more mislabeled stereotypes. Don't you think your friends might be offended if they find out what what you said?