On a recent US TV show the host (who I think is rather proper in English) said to a guest "You are smarter than I are!" Is this correct?
It is not possible to say "I are" - instead of "I am" because it is not correct grammatically. But such use (of I are) may be said by people who make mistakes in English by joking (e.g.in a comedy TV show) or seriously.
Also, sometimes it can be heard by missing of the right pronoun. some people -which their diction is not the clearest- can say "they are" in a way which for some people it can be sounds like I are.
Another option to hear correct use of "I are" is only if before the pronoun I someone else is mentioned in addition, for example, "you and I are strong". It is a correct use of I are- continuously...