Planes landing. My wife always reaches over and feels my palms when we touch down and laughs at how sweaty they are. Even if mentally I tell myself I'm gonna be fine, and think I'm relaxed, I still break out.
Confrontations. I don't handle heated arguments or standing up to someone very well. Even on Blitz if someone takes me on and it's just words with someone I don't know, my heart still races like crazy. (Please don't test this out!)