Argh! Warmth! Exactly. To be honest, the main reason I wash my hands is because during the day I'll be using my keyboard, eating food etc. You wouldn't insist that someone wash their hands after using a keyboard? Well by the standards of this thread, everyone should.
Someone pointed out that blow driers are full of bacteria, germs etc. Well so are keyboards. So are wallets. So are banknotes, so is the air. To be honest, even if you did somehow actually piss on your hands, it would probably make your hands cleaner. In fact, keyboards are probably the worst thing out there.
Oh, and we've already had the hoary old line "wouldn't touch the bowls of nuts on the bar", which, as pointed out, basically never happens in this country. Oh, and to the guy who said he wants to eat crisps, so washes his hands, do you wash your hands before eating crisps if you're in the office? Gotta get that keyboard disease off them before you catch aids from yourself!