….seem to not check very hard.
Read and enjoy the following articles:
Excellent - I should try that before chip and pin comes out 
Extract: Since my local supermarket had one of these electronic screens, it was the easiest place to try my experiments. First, I had to see if the cashier was even watching, so I signed it “My butt.”
Turnpike is another excellent experiment carried out by the same author.
November 1st, 2006 at 12:53 pm
Paul Hancox
Submitted by visitor on Sun, 05/08/2005 - 17:28.
You should now dispute the transaction and get a refund from the card company!!! Ha ha the perfect crime!!!!
We are slowly switching over to chip and pin in the UK but you can still overide it! How stupid is that.