Dots Jokes

Saw this one on a professor's door:
The evolution of mathematics education
during the last 30 years.
1960's
A peasant sells a bag of potatoes for $10. His costs amount to 4/5 of his
selling price. What is his profit?
1970's
A farmer sells a bag of potatoes for $10. His costs amount to 4/5 of his
selling price, i.e. $8. What is his profit?
1970's (New Math)
A farmer exchanges a set P of potatoes with a set M of money. The cardinality
of the set M is equal to $10 and each element of M is worth $1. Draw 10 big
dots representing the elements of M.
The set C of production costs is comprised of 2 big dots less than the set M.
Represent C as a subset of M and give the answer to the question: What is the
cardinality of the set of profits? (Draw everything in red).
1980's
A farmer sells a bag of potatoes for $10. His production costs are $8 and his
profit is $2. Underline the word "potatoes" and discuss with your more...

The young kindergarten teacher had just instructed her charges to come forward as their names were called and be prepared to draw something on the blackboard that had been the cause of excitement in their homes during the previous week. One by one the pupils came forward and sketched such items as report cards, television sets, mothers' new hats, and the like. When it came time for Johnny, the class cutup, to comply with the assignment, however, he walked to the board and simply made two white dots before returning to his seat. Suspecting that he was up to one of his usual pranks, the teacher advised Johnny that he had better be able to explain why those two dots were exciting if he didn't want to be kept after school.
"Well," said Johnny, "the other day you told us that those dots are also called periods-"
"That's correct," the teacher interrupted. "But what could possibly be exciting about two periods?"
"Beats me," more...

Knock Knock!
Who's there?
Dots.
Dots who?
Dots for me to know, and you to find out.

Why do they put Braille dots on the keypad of the drive-up ATM?

What do you do when a bunch of Pakistani with those dots on their heads are around you?
Connect the dots!