Those young whipper snappers don't know everything

At a recent garage sale, we overheard some teenagers trying to figure out some technology. The technology wasn't that old, after all, I used one growing up and mom still has one in her house. What was it that had those kids befuddled? A telephone. A rotary phone to be exact. One kid was pressing the numbers and the other kid had to show him how the turn the dial. How quaint! (my words, not theirs)