Neil Armstrong was known for telling unfunny jokes about the moon to his fans at every opportunity. If nobody laughed he'd pause and say "I guess you had to be there."
Heading out to his shed to grab his tool kit to fix the stopped up drain in his kitchen, Sam noticed his neighbor's little girl digging a hole in her back yard. Walking over the the fence, he called out to her, "Hey Daisy, whatcha doing there?" "Digging a hole Mr. Smith," she replied. "Well, why are you digging that hole?" asked Sam. "I'm concerned that your parents may not be happy with you for tearing up the lawn." "They won't mind. I am burying my hamster Twinkletoes. I left him in his cage on the patio to get some fresh air, but he got out and died." said Daisy, giving him a sidelong glare. "Very sorry to hear that," said Sam, "That is a awfully big hole for a hamster - why so large?" "It has to be big - because Twinkle is inside your cat!"