This was pretty funny one. I was about to start a Windows Azure 30-day trial on Windows 8 with Internet Explorer 10, but it failed on payment options.
I waited for 10 minutes, but no avail. It was pretty obvious that a failure was imminent after 30 seconds of nothingness. The payment just hangs forever without doing anything. They simply never tested it on IE10. On any other browser I tried it works just ok.