I still have a little trouble wrapping my head around the thought that I'm barreling down the road at 3 times a healthy biking clip inside something that weighs half a ton. If I swerve and hit someone, they're dead.
When my older sister was learning to drive, she got in the driver's seat, adjusted everything, and was driving merrily down the road when Mom idly remarked, "You have a half ton murder machine under your control."
When I learned to drive, Dad sat in the passenger seat.