I never had any worst hosting experience so far (luckily), But one of my friend whose in the very cheap hosting business, u know those hosting sites who charge just $2 bucks for a one whole year and even reseller plans which sells for dirt cheap ($10 per yr) This guy recently had his worst nightmare as lot of his dirt cheap unreliable severs went down permanently and lot of his clients lost all their websites and files and their all helpless at the moment without even able to backup their lost files. Its a total web chaos, So my advice to everyone is that, if you want web hosting always go for quality and reliability and never go for those dirt cheap hosting plans who offers unlimited space or transfer or even terabyte plans you simply cannot offer such recourses in real world unless of course you get some unreliable cheap expired servers.