From Matt Groening's Big Book Of Hell, here are "Lies My Older Brother And Sister Told Me."
The Sleeping Alligator Story
Older Bro/Sis: See this? He isn't stuffed, ya know. He's sleeping.
Bro/Sis: If you don't believe me, why don't you put your finger in his mouth?
The Boy-Trap Warning
Bro/Sis: Inside my closet, there's a little door, and behind that little door, there's a boogey-man, and he's set traps in there, little boy traps.
Bro/Sis: And they're baited with CUSTARD.
The Alphabet Trick
Bro/Sis: You can come up in the tree fort if you can recite the whole alphabet. You: A B C D E F G H I J K L M N O P Q R S T U V W X Y and Z.
Bro/Sis: Wrong. Scram.
The Yes-And-No Mind Puzzler
Bro/Sis: Yes means no and no means yes. Do you want me to hit you?
You: Yes! No! Yes! No! Help!
The Lure Of New Toys
Bro/Sis: There's some new toys for you down in the basement. You should go down there.
You: But last time you shut the door and turned off the lights.
Bro/Sis: This time we won't.
The Snowflake Story
Bro/Sis: Well I'll be!! Identical snowflakes!!
You: Lemme see!! Lemme see!!
Bro/Sis: Too late. They melted.
The Movie Switcheroo
You: Hey!! This isn't Bambi!!
Bro/Sis: This's better'n Bambi.
Bro/Sis: I'd like you to meet
Tom. You: I don't see anybody.
Bro/Sis: Tom's invisible.
You: Oh sure.
Bro/Sis: He's an elf. If you're nice to him, he'll give you three wishes.
You: Hi, Tom.
The family reunion, twenty years later...
Bro/Sis: I don't remember doing any of that stuff to you.
Other Bro/Sis: Me neither.
Tree of Life
A young girl sees her father in the shower and asks what his testicles are. "Those are the Apples of the Tree of Life," he tells her, by way of poetic concealment. She tells this to her mother, who replies, "Did he say anything about that dead branch they're hanging on?"
Once upon a time there was three sisters that went to duck heaven. St. Patrick welcomed them and said, "We are happy to have you here in Duck Heaven, but I warn you if you step on a duck in Duck Heaven you will be chained to the ugliest man on Earth!" So, the three girls were really careful where they stepped. After a week the first girl stepped on a duck... so, she was chained to the ugliest man on Earth! After a month the second sister stepped on a duck... so, she was chained to the second ugliest man on the Earth! After a year in Duck Heaven the third sister never ever stepped on a duck so St. Patrick said, "You have been very good here in Duck Heaven so we have a treat for you!" So, she was chained to the most handsome and perfect man on the Earth! "What did I do to deserve you?" she asked the man. "Well I don't know about you lady," replied the man. "But I stepped on a duck!!!"
Yo Sister and Yo Mama
Yo' sister is so ugly, I thought she was Yo' Mama.
A little girl walks into the bathroom and sees her older sister just come out of the shower. The young girl looks at her sisters pussy and asks, "What's that?" Her sister replies, "That is my possum, sis!" The young girl replies, "Oh, Okay." The next day she sees her mother get out of the shower and a pointing at her pussy again asks, "What's that?" Her mother replies, "That's my possum!" The young girl again replies "Oh, Okay." The next day she sees her grandmother getting out of the shower and once again pointing at her pussy asks, "What's that?" The grandmother replies "That's my possum!" The young girl replies "Oh, grandmother, is your possum dead?" The grandmother, looking a little dazzled replies "No, deary, why do you ask?" The young girl replies "Oh, its just that your possums tongue is sticking out!"