Alright, here's one I saw on the net, because I cannot remember any jokes that aren't cheesy or knock-knock or not discriminating, other than this one. . Oh, can you enter more than one time, and can I submit lawyer jokes - or does that count as too discriminating?

Well, here's the joke:

A group of friends who are doing very well in math decide not to study for the exam on Monday. Instead, they drive to another city for a party - on Sunday night. They purposely arrive at school late on Monday morning in order to miss the exam. As an explanation, they tell the teacher, "We went to our friend's party, and when we were driving home very early on Monday morning, we suddenly had a flat tire. We had no spare one and it took hours until we got help."
The professor nods sympathetically and decides to give them a second chance the next day. When they arrive early on Tuesday morning, the teacher puts the students in large classroom, very far apart from each other so that they cannot cheat. The students begin the exam:
The first question - five points out of one hundred - is very easy. When the first of the students completed the problem, he turns over the page of the exam booklet and reads on the next one:

Problem 2 (95 points out of 100):
Which tire went flat?

(if you don't get it, think for a second...)

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Ello, i can haz cheezeburgerz - me iz spekith engrish! - ok dis randum.