When buying something ' As is '
If you purchase something ' as is ' but can prove that the owner was aware of defects but did not disclose them to you at the time of sale, you can ask for your money back. For example you buy a car and it has a problem, you take it into get it fixed and they say that this car was in the other day and they told the owner it was on the way out, you then have your proof. If the seller then says, but I sold it to you ' as is ' you can tell them you found out that they knew it had that fault and ' as is ' no longer protects them - I have seen some agreements of purchase for big items such as houses that try their best to work around this - Again there are those that think, " The customer has no rights " and "Do one to others, before they do one to you "
While on the topic, if a company professes expert knowledge publicly, for example a computer company that has a Logo or catch phrase like " We are the best and know everything " - In the event of a Latent or Patent defect being found in their goods, they are also liable for costs, ie if your PC went down and the hard drive was toast, they are liable for the downtime and data recovery etc