Anyway, my answer is scary movie trailers. The recent one where it takes place is some Swiss or Austrian crazy farm. Anxiety right there.
Also some heights. Like, not top of some tower or bridge or something, but like legitimately dangerous places like scree slopes and cliffs and knife ridges. Last fall I felt myself freaking out on a scree slope and thought I might pass out and had to bear hug a tree with my arms and legs until it passed.