I often go to a certain movie website.
I was minding my own business and enjoying the message boards when suddenly one day I went to the website and I there was a message bar where the forum should be that said
'the administrators have banned you from gaining access. We refer you to the recent email that was sent to you.'
So I did that and apparently I had been banned because they thought I was starting threads and then answering them using another username/profile. I tried to send an email to deny this but I couldn't because they blocked me from doing that too.
So about 8 months later, I had forgotten I had been banned and I went back there and funnily enough I had access to the forum again. This was due to the fact my ISP had changed.
But now a week later I have been banned again, for no reason. This time they didn't send an email. So I used a proxy server and I was still banned.

Makes me laugh more than anything that they take their time out specially to ban me. I mean I am hardly Kim Jong Un or Vladimir Putin.

