Why do people call it an ATM machine, but they know it’s really saying Automated Teller Machine Machine?

Why do people say PIN number when that Truly means Personal Identification Number Number?

If people say if you eat dessert before dinner it will ruin your appetite and won’t eating dinner before dessert ruin your appetite for dessert?

Why do you click on start to exit Microsoft Windows?

If Americans throw rice at weddings, do the Chinese throw hamburgers?

Why is a person who plays the piano called a pianist, but a person who drives a race car not called a racist?