*I'm not racist but my gramps told me this joke and I found it funny, so here it goes*
A white guy walks into the plastic surgeon's office and asks, "I want to be bIack. Can you do that?"  "Yeah, but we'll have to add two inches to your penis, take away 30% of your brain and make you 70% darker."  "Okay."  After the operation, the surgeon says, "I'm sorry, but we've made some mistakes. We cut off two inches off your penis, took away 70% of your brain and made you 30% darker. Is this okay with you?"  
"Si, senor."