Bob is angry with Alice for whatever reason. Alone with Charlie, he begins to describe in explicit detail exactly what he hates about Alice, or otherwise begins insulting Alice. Alice, however, has arrived and is standing right behind Bob just as the list starts getting truly nasty. Charlie can see this, and tries to guide Bob away from his rant. Bob, however, is just getting warmed up, and rolls over Charlie's warnings... until they finally sink in. And then... "She's standing Right Behind Me, isn't she?" Whereupon Alice makes her presence known. Needless to say, things do not end well for Bob.