The funky toothpaste! Hopefully your kiddo isn't over the top tired when he/she goes to brush their teeth because this is supposed to be more of a visual prank. Here's what you do: take a mustard bottle and squirt just a little into the toothpaste tube. When the kid puts the "toothpaste" on the brush, it should be all or at least mostly mustard instead of toothpaste.

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