Either ragdoll inflater or he put it in the skybox.
You all fail except snot because he used Pikmin in one of his :D
Mack! What map did you use with the planes and ship?
Someone needs to go a- *BARFS*
Use materials to make the emitter thing invisible, and use nocollide on the ragdoll and emitter thing. Then pose it so that the puke really looks like its coming out of his mouth :D