For me it's more like: me upvoting my old comment because I forgot I wrote it because I think "Hey, this guy's being reasonable and not yelling at people and stated both positives and negatives about a subject while trying to present a balanced view."

Then a few seconds later, looking at the username and realizing, "Oh hey... that was me."

Alternatively: "This was useful advice and solved my hardware problem, upvote" and then realizing it was also me, but I'd forgotten that I once knew the solution to that hardware (or software) problem.

Edit: although to be fair, in both of these circumstances (particularly the second) I'm talking about the entire internet in general rather than kbin / lemmy.