Thank you.

I've had one occasion where I flatted out twice within about a mile. And it was a dark and lonely forest in Germany. I don't know if I missed the puncturing particle after the first flat (I did check) or if I was just really unlucky. But the patch I'd put on my first flat wasn't dry enough to ride on by the time I got my second flat. I decided to just walk it for a while and I came to a town before long, so I just found a hostel and left both tubes' patches to dry overnight. That's one occasion over a couple of decades of riding, but it was enough to motivate me to always carry a tube and patches--even though one tube wasn't really enough on that day.