The breaker will trip, at worst.... well, worst would be getting zapped when plugging something in, but even then you're looking at a wake-up call at worst (depending on circumstances).
I tell all my contractors (correct that - DEMAND from all my contractors) that they use GFI protected extension cords where exposed to the elements. Ordinary breakers may not trip fast enough to protect you from the shock. I've seen plenty of cords with hacked off ground plugs, non-water tight ends and frayed sheathing. There is no point to getting zapped over a few extra dollars of cost. If I had an electric lawnmower, you can bet your life that I would have it connected to a GFI extension cord.
BTW, you can die from as little as 47 volts.
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