Last week I was riding along and I could hear a vehicle approaching me from behind. I was to the right and there was ample room for the vehicle to pass. It turns out that it was an ambulance, and as it overtook me, it put its sirens on. Startled the heck out of me. After it passed they turned the sirens off again.

I'm willing to give them the benefit of the doubt and say they might not have been just trying to shake me up a bit. They might have honestly been in a hurry and just wanted to let me know of their presence. But still... poor execution on their part. There was really no need for the siren.