How Come?

How come teachers call them blackboards,
When most are green or white?
How come teachers call reading, writing, and arithmetic the Three-R-s,
When only one starts with R?
How come teachers call it schoolwork,
When learning is supposed to be fun?
How come teacher say the school bell rang,
After a buzzer buzzed?
How come teachers say put on your thinking caps,
When hats aren’t allowed to be worn in class?

Just wondering.