Siri does haiku. Haiku is a very ancient form of Japanese poetry, based on a pattern of seventeen syllables over three lines of five, seven and five syllables. It is also the bane of introductory literature students unfamiliar with poetry (or syllables, or creative writing), as often they are required to start writing haiku with little or no background information.
But Siri can make that quite easy:
That last haiku, in fact, is an item of envy: wish I’d thought of that.