Several times.
First time I was a teen driver and I got in a single car accident. Second time, early 20s driver, single car accident. After those, I wised up and started wearing my seat belt!
Next time was major excitement. I was about 26 weeks pregnant with DS, and away from home on a fishing trip. I went into pre-term labor in the middle of nowhere! When the paramedics came into the bathroom, this young kid snapped on his gloves and said "Should I check her for dilation???? I want to be a member of the stork club!" Then hubby was ready to strangle the kid. Luckily, the senior EMT got the kid calmed down. I had a high speed ambulance ride through some seriously windy roads with hubby following behind. Luckily, the labor was stopped, since that hospital had just opened their normal OB floor and the nearest NICU was an hour away!
The last ride I had was in the front seat while they were transporting DD to Children's Hospital in DC. This was when she had the psychotic reaction to strattera. She was completely sedated by that time, so it was an okay ride. And I thank God for those EMTs! They really helped calm me down, and they stopped back to see DD when they came on shift the next day.