Man Flesh
A single line that Lurtz the orc captain from Lord of the Rings: The Fellowship of the Ring, responds with when he is asked, quote, "What is it?" by one of his fellow orcs. "Urr, what is it??" A two second pause.... "MAN FLESH!"
An example would be if you are sitting in class one day and your teacher, who happens to be male, walks into the room. As soon as he comes into view say this,... *sniff sniff*..."I smell MAN FLESH!" Then get up and tackle him and decapitate him if neccessary. If you have a woman teacher, then... well, if she can pass as a man, then go ahead and do it. Might be even funnier. :p