I just about always flat on my first ride on a new bike, it just happens. I always carry two tubes and a patch kit. Occasionally you manage to nail a big hole or rock with both tires, and sometimes that will result in two flats. This can also result in someone getting upset and throwing a bike (seen it happen).
Basic rules of riding.
1) Pump tires up before every ride.
2) Carry enough tubes, tools, etc to be self sufficient.
3) Carry at least $5, if you rip your tire the $5 bill can be used as a tire boot.
4) Accept that crap happens.
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I may be fat but I'm slow enough to make up for it.