Thanks, But No Thanks

The other day I was eating dinner with a friend and she had ordered a specialty drink. I could tell by the looks of the drink that it wasn't going to taste that good in the first place. She tried it and said that it tasted nasty. She then told me to try it...........Wait a minute.

You said the drink was nasty, but now you want me to try it? Why would I want to try something that was nasty? Have you ever noticed that people do this all the time. I have done it. I get some food that tastes a little bit off and I always offer it to someone else to try. Why do we do this?