Dare to scratch
 

Go and buy at least 5 pairs of completely identical underwear and put itching powder in one of them, Randomly mix them and hope you don't spend the day scratching because they stay on for at least 4 hours.

<3 Kah

I haven't done this, but I once did a similar thing. I was in the woods with a lover of mine. I could identify poison ivy, and he claimed he could but I had a feeling he was just trying not to sound less knowledgeable than me. So I pointed out four plants, one of which was poison ivy, and made a bet with him. He would tell me which he thought was poison ivy, and I would rub it on my genitals. If he was right then I'd be miserable down there... but I called it correctly and he didn't know. He picked the wrong plant, and thus I won the bet. Because I won the bet, he had to pose naked in the woods for a photo shoot :-)

Perhaps I'll look into buying some itching powder to try this dare. Anyone know where I can get itching powder?