What smells make you throw up?!
Wasabi! put it in your mouth and keep it in there till you throw up, straight wasabi, nothing else, no soy sauce. The thought makes me wanna throw up. Or mix together food that will taste and feel nasty. My first smoothie I made for myself was so bad I threw up, I mixed the wrong kinds of fruits and vegatables with eachother I guess.
Strong salt water or dry mustard mixed in water are common homemade emetics. You could also do the bulemia thing and gag yourself.
Empty Stomach --> Taco Bell --> 5 burritos --> wait 24 hours --> Restroom