Has anybody noticed (or cared) that telephone keypads are upside down from (most) calculators and numpads?

Yeah, I learned it the hard way.

Back in the '70s, the last five digits of my in-laws' phone number happened to be "14789", which is a perfect "L" on a phone keypad. It was such a distinctive pattern that I never paid any attention to the numbers I was punching, just the pattern. Well, one day I needed to call them from a rotary dial phone and I couldn't remember the number. There was a calculator nearby, so I did the "L" pattern on it, came up with "74123", dialed it, and got a wrong number.