Mandy Moore Accidentally Drugged Her Uncle With "Pot Cookies" (VIDEO)

Mandy Moore looks so innocent. The singer/actress grew up in a religious home, starred in the clean-cut teen drama 'A Walk to Remember,' and started out singing bubbly pop songs -- like her hit single 'Candy.'

Though Moore seems sweet, be advised: she could be "trouble" underneath it all. You know what they say about taking candy from strangers. Though in Mandy's case, it's the cookies that you need to watch out for.

On 'Jimmy Kimmel Live' (weeknights, 12AM on ABC), Moore revealed that did get into trouble recently. She and her husband, Ryan Adams, hosted a potluck supper -- very wholesome and 1950s-ish. But one of Ryan's friends brought over a batch of cookies that contained "a particular herbal ingredient."

Jimmy Kimmel said he had no idea what that meant, but Mandy said her uncle definitely did. Moore's uptight relative "John" (name changed to protect the innocent) came to the potluck. For some reason, he ignored the other treats -- and went straight for the "herbal" cookies hidden on top of the oven.

Uncle John ate one of the cookies. Then he started freaking out. Then, he went to see a movie and started giggling manically. Then, he waxed nostalgic about the hippie decade of the 1970s. Yes, it all adds up. Mandy accidentally drugged her own uncle. But with what? Kimmel provided a clue: "Some people take the term 'potluck' a little too seriously." Jimmy! We thought you didn't know!