ciroccoj | egghead humour

Under the heading of Jokes Almost Nobody Will Ever Get:

Daniel has a new favourite joke:

Three French cats (Un Cat, Deux Cat, Trois Cat) wanted to cross a river. Do you know what happened to them? (click and drag to see answers)
Un Cat and Deux Cat made it across OK, but Trois Cat sank.
What was the name of the Spanish idealist who worked at the dry cleaners?
Don Quixote de la Plancha.
What do you get when you cross an elephant and a tomato?
(elephant)(tomato)sinθ
What do you get when you cross a mountain climber with a mosquito?
Nothing. You can't cross a scalar with a vector.

Say it out loud. "Trois Cat sank" sounds just like "trois, quatre, cinq," French for "three, four, five." Amusingly, native French speakers don't normally get this joke - it's only funny to Anglos who also speak French.
Don Quixote de la Mancha, by Miguel de Cervantes (1547-1616), is the Spanish equivalent of Shakespeare; everybody reads it in school, and most hate it for its archaic language and concepts. The main character, Don Quixote, is a rather cracked out country gentleman who starts to imagine himself as an idealistic heroic knight. He's most famous for tilting at windmills because he imagined them to be hostile giants.

"Plancha" = iron (for pressing clothing).

Hence, Don Quixote de la Plancha.
Trigonometry time: A x B = ABsinθ
More trig time: A scalar is quantity completely specified by magnitude only (a number with appropriate units), such as time, speed, mass and temperature. A vector is a quantity that has both magnitude (a number with appropriate units) and direction, such as displacement, velocity, acceleration and force. You cannot cross multiply scalar x vector.

Biology time: "Vector" is a term used broadly to refer to any animal that transmits human disease or plays an essential role in the parasite's life cycle.

Mosquito = vector

Mountain climber = scaler