The entire episode "Deliver Us From Goodness," which is also a pretty light-hearted, humorous episode, a sharp contrast to the tone of the other episodes.
The ending of "Seymourlama". The obnoxious teenage boy finally gets what's coming to him when it is revealed that he isn't the next Dalai Lama. His parents, whom he had been bossing around the entire episode, kick his ass.
The end of "Monsters in My Room" when the bogeyman pokes his head around the closet door, sees Seth Green's character shoot him a Death Glare, gives a terrified little scream, and ducks back out of sight.
At the end of "the Trouble with Mary Jane" the two exorcists manage to get the two demons out of Mary Jane only the demons end up possessing them, with the female demon in the man's body and vice-versa. Needless to say they end up squabbling with each other again.
The mummy in "The Grave Robbers" is nothing short of hilarious, it's hard to be afraid of a mummy being played by the guy who did the voice of Top Cat.