Yes. Especially when someone else mistyped their email address, you did not ask for confirmation, and now I get endless emails without the ability to sign out. So I just mark everything as spam, which I know isn't what you were hoping for. :)
One of my email addresses is very generic, and I get the same thing all the time - at least one random signup a week... Please, please, please - anybody who has sites that has a signup, the very first thing after saying "Thanks for signing up for [service]" should be "If you didn't create this account, click here" with a link to disassociate the email from the account and never email me again!
It's ridiculous how hard some services make it. Especially banks - I had someone in the US sign up for a bank account with my email, and I was getting fairly important sounding emails (like "your account had insufficient funds to pay [automatic bill payment]" and stuff), and there was almost nothing I could do - to contact the bank, you had to log into your account and use the "secure contact form" or phone them (which would be an international call, annoying time zones, etc.). I stopped getting emails eventually so they must have figured it out eventually!
