Popped down to Dorset the other weekend to visit David, and while pottering about locally this happened!
I can't think of the last time I had a random puncture - I'd say it happens extremely rarely with modern tyres, and spent a bit of time wandering about looking for broken glass etc. However, when we got the car to a tyre place and had a patch fitted we discovered that it was all down to this:
The car was due a service, so David and Caroline did that while I made the dinner. Now we all know who wears the overalls in this relationship...
And yes, I know exactly what's in the photograph. Given that I'm in the photo as I was there at the time, I'd say I'm second only to the person who took it as to knowing what's in it.