I had about a mile left of my 14 mile ride this morning when the bolt that holds the saddle to the bike suddenly sheared in half. It's an 09 Trek Valencia. As I felt the seat suddenly loosen, I was able to stand and bring the bike to a stop with no damage to my nether region, but it was still a little shocking.
Thankfully there was motorist behind me kind enough to honk and point out that I had lost my saddle.
Here's an admittedly crappy picture of the bolt:
I'm assuming this would be covered under warranty. Regardless, I'm letting Trek know about it.