"... every night at sunset, instead of sleeping, your petite little body you're so proud of will bloat up until you weigh 600 pounds! You're going to become what I'll call (and this is genius) a Were-Slob! You're going to get very hungry when you transform, and start seeking out greasy and unhealthy food. You'll start developing very bad gas, causing you to burp and fart uncontrollably. Your body's sweat glands are gonna be working overtime, and your hair's gonna get greasy as fuck! Finally, the most important change of all, you'll lose control of your bowels and bladder, not even bothering with going to the bathroom and just shitting or peeing your underwear, if you're wearing any that is! I'll be generous and allow your clothing to transform with your new size, and you'll go back to normal by sunrise. But on a Full Moon night, you'll stay that way, even by daylight, until the New Moon. You can make more women into were-slobs like yourself by having them smell your gas when you're transformed.
"Whenever you transform, your brain will change a bit. Number one, you'll love your slovenly new body, like the rancid smell of your bodily odors, like pooping yourself, and want to convert more women to be just like you. Second, you'll be completely unaware of your transformed self, save for vague memories of what you did last night... with appropriate details as needed of course. Third, you'll forget all about this phone call once you hang up, but not that you got transform or dared. You can't use it to turn yourself back to normal, but you can use it for something else. That'll be about it. Whadda ya say to that?
"I say, fuck you, you degenerate douchbag," Jen seethed into the phone, "And transform or dare."
"Dare," Kyle replied simply.
"I dare you to go FUCK YOURSELF, ya ginger pubed sack of dicks!" she shouted at him before slamming the phone back onto the receiver.