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Yes, humans run on electricity, but it's only a few millivolts. It's generated by the food you eat, though I don't really know how. I'm gonna look it up. There's a theory that living near powerlines, cellphone masts, and inside Bluetooth and wifi, messes with your natural electricity a bit and causes weird stuff to happen (notoriously, cancer is more common in those living under phone masts). However, this might equally be about magnetics, since magnetism and electricity are the same force.

The other type of electricity we carry is static electricity, which everyone is familiar with. Personally, every time I take off a piece of clothing there's a sound like ripping velcro, but that's probably just the combo of clothes I ear rather than any ability of mine to control or harness electricity.
A cool trick, if you don't mind smelling like charcoal, is to put a penny on top of one of those [link=http://tenos.files.wordpress.com/2007/09/plasma_globe.jpg]plasma globes[/link], and then hold your finger a little above the penny. There'll be a tiny spark - either the globe is charging you, or your static is being discharged into it.
BTW, static shocks occur when you and the thing you touch have a different charge; the electrons sort themselves out to make you both equally charged, and the movement is what causes the shock. Rubbing things with different cloths (nylon or whatever) changes their charge, to positive or negative. Likewise the balloon-on-a-sweater trick. Cars also end up with a negative charge as the air flowing over them takes the positive ions/electrons.
It's also how monochrome photocopiers work.