It's Harrison, sir."
Who: Mr Harrison (Graham Chapman)
Source: And Now For Something Completely Different ("Self-Defense Against Fruit" sketch)
Note: After the instructor explains to the class how to defend yourself against anybody armed with a simple banana (force the person to drop it, then you eat it), he picks upon Mr. Harrison to demonstrate. He has the young man charge at him with the banana, before shooting the lad dead with a shotgun. Then, he eats the banana.