This happens a lot on the reddit mobile app. Sometimes I'm just browsing and out of nowhere I see an orange upvote or a purple downvote that I likely trigger just by scrolling to the comments.

It also happened to me once or twice that I was looking at the Facebook profile of someone and then 2 hours later I got a notification saying that that person accepted my friendship request. Somehow I mistakenly sent those requests.

At least for the latter, I've always thought there should be some impedance to avoid this. Like slide to send request or some other small friction interaction.