Easiest piece to get tunnel vision with and forget about?

Which of your opponents’ pieces do you think is the easiest to forget about? I’d say the Bishop, especially if it’s closer to the edges of the board. A lot of bishops usually just camp and play a mostly passive role after they’re developed, so I’ll forget about it during the game and next thing I know, the bishop comes flying out of nowhere from across the board to take a piece or deliver a check mate.

I’d say that Knights are definitely the most dangerous in close quarters and are the hardest to calculate when it comes to what the opponent plans to do and what the knight will be threatening on any possible next moves, looking for forks, discovered attacks, etc, it can get messy with a knight. But I think that’s also why the bishop is the easiest to forget about. I’m fending off his other pieces that are much closer to me, so naturally the bishop just kinda gets forgotten about. Doesn’t happen too often, but if any piece is gonna make me go “sh*t I did not see that” it’s the bishop.