The button on my mouse that changes the sensitivity. It's right on top between the left and right buttons, so it happens quite frequently. Maybe I should finally figure out if I can disable it in settings somewhere, but then I'll need to change sensitivity for some reason.

Also, when I swipe back on Android and it takes me to the home screen, closing the app. When I swipe back on purpose I don't even want to go back to the home screen, usually just the top of the app, or clear route etc. from Google Maps, but it's even worse when I accidentally swipe. Whoever made that design choice deserves a kick in the groin. That is like the most single annoying thing about Android I can think of.