Over the years, I have used quite a few different hosting companies, and only one was the absolute worst.
When I first started creating forums, my dad suggested a hosting company he had been using: BigWetFish Hosting. I went with them, and for a while, their hosting was perfect, but a few years down the line, I started having issues with a lot of downtime and even slow loading.
I later found out that they had started hosting way too many different websites on the same servers through their shared hosting, which was causing issues, so I eventually moved.
What has been the worst hosting company you have ever used?