Most of my scary moments involve being a passenger in a vehicle.

First, there's the trip to LAX with Mr. SanDiego behind the wheel. (kidding, sort of)
Driving in Peru along the steep mountains in a double-decker bus. I couldn't sit in front and watch, too scary.
Taxis in Cairo. They just make lanes wherever they want to.
Being on the back of a motorcycle on the freeway between Venice and Milan. The drivers seem to think it's a game of chicken, and pass so close you could almost touch them. They all want to be Mario Andretti. My imagination goes into overdrive, picturing the carnage that could be. I close my eyes to avoid seeing them.