The most interesting puncture that I can remember was a bayonet sized shard of glass from a broken beer bottle that penetrated the ride-like-an-ox-cart Armadillo on our tandem. Those itty bitty wire things - unfortunately I don't think they are all that unusual but they sure can be hard to find in your tire.
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My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.