Prank ideas..good ones :)?

Well, if you want to get her while she's sleeping, you can always go with the classic put-her-hand-in-a-glass-of-warm-water-an… but that's one that everyone probably already knows. Now, if you'll be sleeping at a hotel or whatnot, and she'll be sleeping in a four-poster bed, bring a huge roll of yarn with you. Tie one end to one post, then wrap it around all the other posts so you have a rectangle with an "x" in the middle. Then take the remaining yarn and tie it in random places so that it looks like they're sleeping in a giant spiderweb. Film their reaction when they wake up and can't get out of bed. It's priceless. :)