lol I'm a 36 year old hacker who forgets quickly myself. After 4 iPhones, I used a Galaxy S3 for a few weeks. When I got the iPhone 5S, for several days I kept pushing the right lower side expecting a back action.
On my iPad mini, I keep trying to unlock it with my fingerprint.
I'm still on my first smartphone and it's an HTC Android phone. Using iphones and ipads that weren't mine, it took me a while to figure out that you can double-click the single button to get it to do something different. Trying to interact with it with only one pressable button kind of feels like having flippers instead of hands. I haven't quite grokked the one-button doctrine.