To imitate Hannibal Lecter (aka Hannibal the Cannibal) when told there is (insert meat product, usually liver) for dinner.
Typically used to annoy vegetarians/those of sensitive disposition.
Also very effective at parties to put others ahead of you in the queue off their food so you get all the good stuff.
"Hey, guess whats for dinner? Liver and bacon."
"Eww. Whatever, do you have to lecterise? "