One to watch out for:
People are distributing free "lottery" tickets to win a Nissan Micra door-to-door at the moment all you have to give is your phone number.
Suprisingly everyone who takes a ticket gets a call that same evening saying "You've won!"
Sadly you haven't won the Micra but rather a free carpet shampoo - which of course isn't a free carpet shampoo it's the boys and girls from Kirby vacuum cleaners doing a huge, overlong demonstration of their very, very expensive average cleaners.
DON'T GIVE THEM YOUR PHONE NUMBER!