Used to be quite OK with heights. When I was much younger I even owned a hang-glider at one time and have sky-dived (dove?) a couple times.
A number of years ago, when I was on the job, I was patrolling over a local bridge around 3 am one very quiet evening. Had just done a u-turn and was making my way back over when I caught a movement out of the corner of my eye (not sure even today how my mind interpreted everything as it was just a blur/instinct). I slammed on the brakes, leapt from the car, over a cement barrier separating the road and sidewalk, two running steps across the sidewalk and a semi leap forward over the railing and grabbed a 16 yr old girl who was just letting go of the cable to jump the 200 feet to the water below.
I didn't have a chance to broadcast my situation before exiting the car or on the mike between the car and railing as I didn't want to startle her and have her leap before I got to her. So, the problem I then faced as a result, was I had both arms around her and the cable, was semi hanging over the rail and couldn't release my grip to get to my mike. On top of that, she started to curse me and fight like a cat, first to get out of my grip and jump, then tried to pull me with her. Although it was probably only minutes, we fought and struggled for what seemed like a week. Funny enough, my marked pc was parked in the curb lane with the door wide open and no-one in the 20-30 passing cars bothered to stop. Finally a cabbie stopped and helped me drag her over the railing.
Since that night, me and heights do not get along very well. At all.