My favorite quirk, which they recently did away with, was in Google docs and sheets. They made a custom right click menu that had it's own Copy and Paste buttons. If you tried to use these "Copy / Paste" options, a full page popup would appear telling you to "Use Ctrl + C / V instead".

So someone at Google was unsatisfied with the system right click options, so they remade them. Then someone else at Google probably thought that was dumb and put the popup to remind people that Ctrl + C / V is better? I don't know, all I want to do is move data. But now I have to confront this issue, which takes me away from my actual problem and makes me process some new information that is completely irrelevant. And besides, I already pressed the button. Why didn't you respect that button press? Why did you give me the option to press that button if you didn't want me to use it?

Thanks Google.