My sister has been pestering more than usual today and I have vowed revenge... Does anyone have creative ideas on how to get revenge? She knows all the classic ones so I have no ideas currently...

P.S. I don't want anything that'll get me grounded

Then felonies are out? I'll have to think on it.

If she has a conventional phone in her room, removing the mouthpiece is always fun. So is taking the phone apart and rubber banding the switch hook down. I usually called when I did that so I could be nearby.

My favorite has always been to do nothing. Just smile and let the other person's imagination do the work for me. I can't get in trouble for what they are thinking. ;)

I used to remove my cousins light bulbs. Every day and then play dumb. Also if you can get your hands on some essence of sour, and put it on her tooth brush... she'll be in for a BIG treat! :D

If you can arrange it, let her "catch" you closing her door like you just came out of her room. Then do the "just smile" routine while she freaks trying to figure out what you did.

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Enough safe and free stuff here to give most anyone a mild breakdown.

I hid her bamboo plant and have other things in store however; I must be ready to defend myself because she is angry

You can always put plastic wrap on the bottom side of the toilet seat so she will have a bit of a mess when she goes to use it.
Or you can soak all her underwear in water and then stick them in the freezer.
You may get in trouble for these though.

If she has a chair with a cushion put a little water in it, You'll find out how real fast when she sits on it. If you have a pet maybe you won't get caught. Not allot of water but just enough! He he!

I tried fake shampoo on my little sister. It was made of lotion, egg whites, and mayo. Although it may not work she smelled it first. I'm looking for new ideas now before she's able to get me.

Hmm... my sister has a blanket and when she finally makes me mad I hide it. She freaks out so much. Or when she loses her iPod. I act like I have it but I don't. I get a kick out of it and I also don't get in trouble.