Where will the word/phrase/topic come from? I'm not sure...but it won't be difficult to find something new.
I present to you today's Wikipedia word of the day: catnip.
My favorite snippet:
"When cats sense the bruised leaves or stems of catnip, they will rub in it, roll over it, paw at it, chew it, lick it, leap about and purr, often salivating copiously. Some cats will also growl and meow. This reaction only lasts for a few minutes before the cat loses interest. It takes up to two hours for the cat to "reset" and then it can come back to the catnip and have the same response as before."