Not sure if it counts when we weren't the ones driving (I was 11 at the time) but the night of Christmas Day 1993, on our way home from celebrating Christmas at my grandparents (typically about a 20-30 minute drive), a sudden snow storm that I don't believe was previously in the forecast hits us. About half way home it got really bad and we got stuck going down this pretty steep hill. My dad, and other cars, had to pretty much crawl down this hill knowing that at any moment our car could just start sliding uncontrollably down. We eventually got down safely but there was a lot of anxiety getting down that hill and the rest of the drive was pretty scary as well. Then, we got to the highway, not too far from our house, and there was just stopped traffic for miles due to an accident way up ahead. When we got about a mile from home, everyone but my dad got out and walked through the snow the rest of the way home. Eventually, my dad was able to fight through the traffic to get the rest of the way home safely but that was one very memorable drive/ride.