I asked it to write a haiku about explosive diarrhea. It got the syllable count wrong a few times, but the haikus were incredible! I find the AI is especially good at combining random cultural elements into songs, poems, and stories. It is also good at matching the tone/voice of various authors (ie corporate-speak, the bible, a rap song, etc)
Here's the launch thread, posted several minutes before you asked this: https://news.ycombinator.com/item?id=33923907
You'll find a lot of great examples on the site (and please share more as you find them).