Naughty games to play with a female friend?

[Jake]

Next year, going to Sydney. My female friend has decided to be evil and has told me she will be trying to give me an erection in public and other things like that, and if she succeeds, she wins.
We're really close so pretty much any thing goes. What I need from you, is a couple ideas I can do to her.
Anything at all that is even remotely like hers. I honestly have no idea. The only thing that comes to mind is trying to catch her in the nude.
Any idea will help. Please try to have a couple suggestions though

[Klathorn]

Convince her to goto the beach with you. Gift her one of these...

http://www.geekologie.com/2009/07/wear-t...-disso.php

oops here...
http://www.racheshop.de/frivole-scherzar...slich.html

[JMan23]

Tell her there's absolutely no way a blowjob will give you an erection, and she will never win by trying.

[Forever]

1. When she is sleeping, dress up in a wig, dress and terrible makeup. Wrap your arms around her and take a picture! Then, threaten to upload it to youtube or facebook! But hide it from her before she has the chance to upload it against your wishes, after all, you will be the guy dressed as a woman!

2. Tell her that if you can get her to expose her bra, any part of it including the strap, you win. Then, put a frog, ant or some creepy bug on her shirt so she freaks out trying to get it off thereby exposing her bra strap or something.

3. Get her to do something silly, like ask her to try to climb a pole in a bathing suit with a blind fold on or ask her to do her best impression of a dog having a heart attack for 2 minutes. Secretly video tape this activity and upload it to youtube, or at least threaten to!

4. Because you are a guy, and she is not, it is hard to think of anything "appropriate" you can try to get her to do that is similar to what she is thinking. You could try challenging her to an eating contest. Something where you make each other eat disgusting foods. Whoever vomits first loses!

5. Challenge her not to yell at you all day. Then dump cold water on her, put hot peppers on her sandwich,put peanut butter in her hair etc...