I tried to give notice at AOL once. HR rejected the letter due to some expletives, and asked for a revised version. I then submitted a 1-sentence notice.

Lesson learned; don't swear in notices, but also keep it simple. Even if you tried to offer them your honest view of how things were, chances are they'd get filed in a drawer and stuck away.

It took a number of people handing notices day-by-day at AOL before HR clicked that something was wrong, so at that point they invited the Sales team to the NY office (the sales team hadn't been on an overseas trip before). It was a nice gesture of the company; shame that the people got food poisoning on the first night.