[Serin]

Here's some excerpts from an article I found about it..

But we don’t always like to bother with directions. Those who haven’t completely followed instructions offer cautionary tales on the drug company’s Web site.
“(I)’ve pooped my pants 3 times today, and sorry to get descriptive but it even leaked onto the couch at one point!” writes one user.
It can strike any time — even in the early hours of the morning. One user writes: “(Y)a know how when you start moving around in the morning ya pass a little gas. Well, I did and then went into the bathroom and to my horror I had an orange river of grease running down my leg.”
Fellow cheaters advise each other on the best clean-up methods, and some even suggest using panty liners or Depends. One frugal user noted, “I’m thinking that infant diapers might be a cheaper way to go, just use them as a large pad.”
The gross side effects might scare away the less-committed, but some experts appreciate Alli’s very real, very immediate consequences of cheating on your diet.
“It forces you to eat a lower-fat diet — if you don’t, you’re violently penalized for not doing so,” says David Sarwer, the director of clinical services at the Center for Weight Loss and Eating Disorders at the University of Pennsylvania School of Medicine. “When they eat a little too much fat, they’ll learn not to do it again.”
The drugmaker claims Alli is promoting healthier lifestyles by teaching users that weight loss involves eating healthy food and getting enough exercise — and Sarwer agrees.
“People who are struggling with their weight assume that thin people never think about what they eat,” Sarwer says. “I’ve always been impressed by patients who really rolled with the punches with some of these events. They say, ‘Well, I learned that I couldn’t do that. It taught me to eat differently.’

LoL "Pooping my pants really taught me not to eat fatty foods.. Thank you Alli!"