Mine would be to remember everyone's names instantly and forever.
I'm rubbish at it. I try and take advantage of the window of opportunity when it's still not embarrassing to ask them "Sorry, I've forgotten your name," the second or third time I meet them. But when you've been chatting occasionally to someone for literally years, it's a bit awkward. I remember the interesting stuff about people, like their job and where they are going on holiday this summer. Just names that evaporate.
So what trivial superpower would you choose?