(Update : We just received an e-mail from Casey Bridge, the student mentioned below. She sent along a picture of her, Tillman, and the math question. This is now officially awesome.)
My name is Casey, and I am the lucky girl who got her homework signed by Peanut Tillman. I wanted to just give you some more information on the matter. I was indeed at a running store that my father manages (Universal Sole) but it is not suburban, it's in Lakeview. They were having a fun run, and I was doing homework that my accelerated math teacher had assigned. I was an 8th grader at a CPS school at the time. I saw the assignment, and realized it could not have been more perfect.
All I asked for was a signature, just to poke fun at my teacher, but Peanut was so gracious and funny that he wrote the entire paragraph. I then showed Mr. Amrein, and he thought it was very funny, and gave me an A (but I also got the original question correct). He then gave me no homework for the rest of the week, and said that he only gave the problem "based on statistics". He is a fantastic teacher, and makes math more fun with things like this. He is not at all rude, or biased, but just an exceptional math teacher. Thank-you for posting this.