1. Assholes who spend their time making a virus that can get through my AVAST firewall

2. Perverts and paedophiles, most of them live on the internet, lurking, watching, waiting for their next victim to sign into the very chat room they've been sat at for 36 hours

3. Identity thieves, aka the people who find your credit number, the people who post pictures of somebody else claiming it's them, and the people who use your email address to sign up for porn sites. I'm not sure if the last one is identity theft, but it's still annoying

4. Spam, aka some person claiming to be a prince from Africa, wanting to share the millions he just inherited with you, but only if you hand over your credit card details, and at least $3000 which would pay for the money to be withdrawn, their new tv, a bag of doritos, and maybe even a hooker