A merchant crosses your path -
"I've got nothing, I tell ya."
The anniversary of your BotB account creation date. This special day will be automatically announced on the home page for all to see. Expect many heartfelt burday wishes, for you are loved.
The n00bs that didn't care to activate their account and naughty spammers also hit the burfday list, but by the next year, they usually fade into obscurity (where the latter should belong).