fat man yelling 'SSSSSSSSSSLLLLLLLL LLAAAAAAAAYYYYYYYYE EEEEEERRRRRR!!!!'

If you watch to the end of the credits the real nerdy fat kid does the funniest thing. He yells slayer at the top of his lungs and it drags on and on until he runs out of breath like 10 seconds later. He looks so proud of himself though definitely worth a laugh.