Ew, yes, you read right. Owl Pellets: masses of bone, teeth, hair, feathers and exoskeletons of various animals preyed upon by raptors, or birds of prey (re: spitballs of nastiness). For the lighter stomachs out there, have no fear, this Halloween party favor tutorial is from yuppie central, Martha Stewart's craft department, so all bones and other indigestible matter are completely faux.
(If you're like me, and you're oddly fascinated by the disgusting real deal, Martha Stewart recommends picking up some real owl barf at Pelletlab.com.)
Click through for instructions on making your own.