Easiest way to throw up?

I could sit here and type out a million reasons why you shouldn't do that, and shove it in your face that you could have an eating disorder, and I could list off a million different ways to make you puke - but I am not, but I have personal experience, my friend wanted to know the same thing, and when she found out how, she started to, once everyday, and now someone has to follow her around to make sure she doesn't go to the bathroom and start gagging herself - she has ruined her life and she hasn't even realized it....its been over a year since she started