Cloud computing provides plenty of perks for both businesses and casual users, but while cloud servers may live in fluffy white shapes in the sky, they aren't immune to earthly errors.

As any cloud dweller knows, Web-based services can crash and burn just like any other type of technology. If the companies behind them are smart, you shouldn't lose any data in the long run -- but you'll likely lose a bit of sanity during the time the service is offline.

While 2013's only halfway done, we've already seen some cringe-worthy cloud failures this year. Here are the worst -- so far.