Yesterday, while I was checking my yahoo mail.. the number of unread mails made me surprised !!
I'm sure you are now thinking about (1000 unread) ones or sth.. but here's wt I found in the title of my page : "(-9 unread)" !!!!!!!!
Its one of the funniest bugs I ever saw :D :D .. so I just thought of sharing this here.. the only excuse is that Yahoo mail is still in Beta.. Anyway, here's the screen shot..