Halloween special the moment when grandpa Simpson runs into the room holding a wooden spoke and yelling "We MUST KILL THE BOY!", someone replies that Yes, Bart is a vampire!, then grandpa screams and runs back out in panic!
and of course the "tompsons" episode when Homer scares Bart to death twice in 10 seconds, first time running into the room with a big knife and red-glowing eyes asking if he wants some brownies before he falls into sleep, and the second time with a ski mask and his new chainsaw!
