What is derivative of Square root of 3?
When I was teaching my classmates derivative back in highschool. I asked them what is the derivative of $\displaystyle e$, they were puzzled and said "is it $\displaystyle e$?". I total them "No", it is a number, and the derivative of a number is always zero. Then I ask them (immediately after that) what is the derivative of $\displaystyle \sqrt{e}$. And they say "well write it as $\displaystyle e^{1/2}$ ... ".