> This note is from an external source and is used for backlinking purposes. Its contents were pulled from the [University of Tennessee at Martin](https://iep.utm.edu/fallacy/#TuQuoque). The Fallacy of Tu Quoque occurs in our reasoning if we conclude that someone’s argument not to perform some act must be faulty because the arguer himself or herself has performed it. Similarly, when we point out that the arguer doesn’t practice what he or she preaches, and then suppose that there must be an error in the preaching for only this reason, then we are reasoning fallaciously and creating a Tu Quoque. This is a kind of [Ad Hominem Circumstantial](https://iep.utm.edu/fallacy/#AdHominemCircumstantial) Fallacy. Example: > Look who’s talking. You say I shouldn’t become an alcoholic because it will hurt me and my family, yet you yourself are an alcoholic, so your argument can’t be worth listening to. Discovering that a speaker is a hypocrite is a reason to be suspicious of the speaker’s reasoning, but it is not a sufficient reason to discount it.