Sticker on computers
A warning label.
You don’t know
The teacher came up with a good problem. “Suppose,” she asked the second-graders, “there were a dozen sheep and six of them jumped over a fence. How many would be left?”
“None,” answered little Norman.
“None? Norman, you don’t know your arithmetic.”
“Teacher, you don’t know your sheep. When one goes, they all go!”
Taller than me
Mr. Smith: Why?
Mr. Anderson: Because she is taller than me.
Complaining of insomnia
A man went to the doctor complaining of insomnia. The doctor gave him an exam and found nothing physically wrong with him. “Listen,” the doctor said, “if you ever expect to cure your insomnia, you need to stop taking your troubles to bed with you.”
“It’s true,” said the patient, “but my wife refuses to sleep alone.”