Why won't the US change over to the Metric system?
Because we'd rather die on our feet than live on your 30.48 centimeters.
Someone told me they didn't like calculus
I told them their opinion would change over time.
"I want three children," said my wife.
"I think I'd prefer to have two," I replied. "But that might change over time."
And it certainly has. Now that we've got two I would prefer we had none.
An old engineering professor ...
An old engineering professor was welcoming the incoming class of freshman. "I've been teaching here for over 50 years and have seen some dramatic change over that time. When I started, less than 5% of the class was female, and they all looked like they were kicked in the face by a horse.