I have had several cases where someone with a similar email address to mine signed up for Myspace, Bebo, and CareerBuilder with my email by mistake (I think it really was a mistake). The stupidest thing is, these websites gladly reset the password for his account by sending it to my email, giving me access to all the data he had put on all these websites: names of friends, home address, place of employment, some possibly embarrassing forums he frequented, etc.