Latin] "it does not follow." It is drawing a conclusion that does not logically follow. It logically follows that if it rains the ground will get wet. It does not follow that the houses will turn red. That "the houses will turn red" is a non sequitur.
Non Sequitur is a comic strip created by Wiley Miller (usually credited as just "Wiley") in 1991 and syndicated by Universal Press Syndicate to over 700 newspapers. The strip can be found online at gocomics.com, although archives are only viewable with an account. Translated from Latin as, "it does not follow", Non Sequitur is often political and satirical, though other times, purely comedic.
A non sequitur is a conversational and literary device, often used for comical purposes (as opposed to its use in formal logic). It is a comment which, due to its lack of meaning relative to the comment it follows, is absurd to the point of being humorous or confusing. Its use can be deliberate or unintentional.