At the Midtown High School by Peter's house, head to the front of the school where the flag is. In front of you will be some stairs. Look at the back of the right stair rail and there will be two words written in red "GELDOFF RULES!". This is a reference to the Ultimate Spider-Man Comic Issue 27 and 28 when there is a mutant named Geldoff at the school who is a student. He nearly destroys everything but Spider-Man stops him. Also, at the same time all the other students are chanting "Geldoff rules!"