In reply to Enty:
agreed I cant work that one out, one tube would be twisted around the other no no.
My suggestion would be to change your tyres to ones with better puncture protection. Im yet to have one with continental gatorskins, ok they do weight a bit more than my pro3 summer tyres but its quicker than getting a flat.
As previously asked, what pressure are you running them? Its worth getting a pump with a pressure gauge on it as its hard to guess the pressure by feel alone. Most road tyres will need to be around 100psi to work correctly and avoid pinch flats.