Fake vomit
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Fake vomit is a flat plastic disc with indentations and protrusions designed to look like mucus or vomit. It is a practical joke often used by pranksters to disgust victims.
The prank is performed when the prankster wraps up the fake barf in a handkerchief or tissue paper and mixes with a crowd. The prankster would draw attention to himself/herself by putting the handkerchief or tissue to his/her mouth, concealing the fake barf from view. The prankster would then pretend to sneeze or throw up in the handkerchief or tissue. When he/she is done, the prankster would reveal the fake vomit, disgusting the crowd watching the prank.
Fake vomit may also be made as a concoction of liquid non-staining substances made to look like more realistic human vomit.