I got a flat tire on the way home today. Checking the outside of the tire, I found a construction staple. The staple came out cleanly and it was raining, so I decided to skip the usual formality of looking for pokey bits on the inside of the tire to get the job wrapped up quicker. As I got closer to home, the tire was starting to feel a bit soft again.

So when I got home I put the bike in the stand and found...two more staples!

I guess when I inflated the tube it must have pushed the staples to the side just right to avoid an immediate puncture. I rode about four miles with those things embedded in the tire and still had around 20 psi when I was done. Of course when I pulled them out it deflated like a balloon.