Imagine Thomas Edison electrocuting a horse...

America's wild frontiers weren't just restricted to its, well, wild frontiers. The cowboy ideal penetrated all facets of its culture. Even science had its wild colonial days. Perhaps it's not quite right to say science though, because essentially it was about business.
Thomas Edison is a name familiar to most, and it's a fair bet that most people would know that he had something to do with electricity, or at least remember that he invented the light bulb. Nikola Tesla is a name that would be unfamiliar to most. Devotees of The Prestige might remember that David Bowie whipped up a curious Eurotrash accent to portray him as a mad scientist, but let's face it, there aren't many people who watched that movie and even fewer that bother reminiscing about it. But Nikola Tesla is a very important man. The computer I'm writing this on has numerous components that owe their existence, in some form or another, to Tesla. If Edison was the "father of electricity", then Tesla was surely its pimp, because he was the man who found a way to make it available and user friendly.
Without getting too scientific (or more accurately, not getting scientific at all. If anything, a little patronising) Edison and his team of scientists and inventors created power stations and electrical goods that ran on Direct Current electricity (this is the type of current that means when you're electrocuted, your muscles contract and you can't let go of the wire). The problem with DC is that it can't be transported over long distances. This meant that, for example in New York, power stations would be needed every two blocks or so to make sure everybody could get enough juice to run their radiolagraphs and brill-o-lamps, or whatever people plugged into sockets in the late 19th century. This is bad news for people wanting power, but good news if your company (General Electric, although readers may be more familiar with the company's modern incarnation GE Finance, home of the culturally sensitive GE Money Genie) builds power stations and sells DC-motor powered appliances.
Tesla, who worked for Edison in his early days (and made him some decent scratch), developed technology that could harness Alternating Current. This is the current that tosses you across the room when you touch a live circuit. Alternating Current can be transmitted across vast distances, as well as be easily converted to the low voltages needed for domestic use. In combination with entrepreneur George Westinghouse, Tesla began promoting AC power and appliances to the American public. (Westinghouse and Tesla also had a contract guaranteeing Tesla $2.50 for every horsepower of electricity sold. With more success, this agreement threatened to bankrupt the Westinghouse Electric Company, and Tesla tore up the contract.)
Edison was, rightly, nervous about the emergence of AC power, and embarked on a scare campaign about its safety. Stray dogs and cats, old cows and horses were trotted out in front of the American public and executed to prove that AC power was unsafe. Tesla responded by holding demonstrations where he would pass AC current through his body, illuminating a light bulb he held in his hand. These demonstrations were accompanied by various lawsuits, and the obligatory defamatory comments in newspapers.
In 1890, Harold P Brown, who was on Edison's payroll, used an AC motor and generator to create the world's first electric chair, to prove once and for all that AC current was a danger to society. William Kemmler was the lucky prisoner to be spared the horror of hanging for the ease and convenience of electrocution, or as Edison was calling it by then, "Westinghousing". Unfortunately for Kemmler, they couldn't get the voltage right the first time, and he had to receive a second jolt to finish the job. As Westinghouse reportedly said: "They would have done better using an axe."
Eventually though, Tesla's AC system won out, and all the appliances we use today owe something to his groundbreaking work with AC. But the next time you flick on the television, or toast some bread, take a moment to reflect on the fate of poor Topsy, the elephant who died as part of a vain attempt to stop you enjoying cheap, easy electricity. (The video is a little unpleasant, so I don't mind if you don't watch it. Let me summarise it for you: an elephant gets electrocuted.)