I do not know if he is stupid of careless or what, but I just know that somewhere, someone must be able to come up with a joke about wide reciever Plaxico Burress and ...
the free safety!
UPDATE: Saturday Night Live got it done. You can see to the whole clip and the relevant passage is at 2:10, but the joke is
Seth: This is why guns have safety's.
Plaxico: I'm a wide receiver, Seth. There are two things I hate: cornerbacks and safeties!
Scott's addition is good too. (See comments)