5 seconds?! What was he eating???
Okay, I feel for the poor guy but you can't help but laugh! I'd love if someone burped or farted in the exam! It would break that awful tension.
My advice is talk to the poor guy, he's probably on the verge of suicide...
In my exam hall, there are pigeons nesting there and they make the most enraging cooing noices as you try to concentrate. I swear, I have never wanted to kill something (short of Nick Griffin) as much as had done then.