Timmy tries to win the heart of Trixie by wishing that he was the funniest guy on Earth, but when he finds out that a seemingly harmless plant he gave her is going to grow to gigantic proportions and eat her at 12 midnight he must find a way to warn Trixie without her not taking him seriously and laughing. He cannot un-wish his wish either because Wanda and Cosmo are too busy laughing at Timmy to take him seriously, either.