I once got more than 9 pinch punctures when riding/pushing my road-touring bike on a very gravelly track in Finland. Bizarrely the air seemed to stay in the tube then came out suddenly once I had reached tarmac and gone about 200m. The valve on my one spare tube was broken, and I only had 8 puncture patches so ended up stood at the side of the road in the middle of nowhere feeling very sorry for myself about 10pm on a Sunday evening. Luckily eventually a passing car stopped and the nice people took me home, gave me dinner, beer and a bed, the guy even sorted out my bike, and they sent me on my way the next day with two (!) spare tubes, puncture patches and a great packed lunch.