One of your good friends wants to be on American Idol. He or she wants to audition, and is very excited about the chance. This IS their dream come true. However, when they perform before you, you realize that not only are they bad, but they're downright awful. Picture William Hung, only even more tone deaf. This is definitely the kind of performance that gets on the AI 'wow these guys really suck' episodes, the ones who get mocked and laughed at. You feel your friend will wind up on the blooper reel, and he or she will be devasted and publically humilated. However, your friend thinks that he or she is pretty good and has a chance.
Do you tell them the truth to protect them from probable extreme embarrassment, crushing your friend's dreams under your own foot?
Do you let them keep on believing they have talent and go on to the audition, and come what may, it's not your fault?