Paper Mario: The Thousand-Year Door Tips

Crazy Petuni!
After beating Chapter 2, talk to Petuni(Punie with the pink antenna). She will ask if you wanna play a game of which you will win a Mystic Egg if you answer:

Mario likes which person the most?

But that's besides the point. If you say no to her, she gets mad and after you finish talking to her, she jumps around like crazy! Only way to make her stop is to win the Mystic Egg or fail.