Ever caught someone being wrong about something? What was it like?

Say a very well meaning friend offers you a health product to make you feel better for your sickness. When you ask them the features of the product, they give you this great explanation about how it will do this and that for you.

Then, in your excitement and desire to find out more you look online and discover that they really had no idea what they were talking about. Actually, this product is kinda not held in high regard, and the product certainly doesn’t work the way they described. You spent 2 minutes online and you can now re-explain how the product is suppose to work better than they did.

Do you confront your friend about their complete lack of accurate information?