A quick shot? No money? Don't bother with a prosthetic; just kinda flatten the actor's hair down with some Karo syrup or hairspray (to make it look bashed in). A little black makeup smeared in there will encourage an impression of depth.
Then dress it with some goopy fake brains. You can make those with a thick corn starch and water mixture, heated on the stove. Add a little red food color (just a drop or so) and then maybe some milk, to whiten it. Go for that pink brainy color. It'll really get thick when it's cooled down. (You could use real cow's brains from the butcher shop, but that's pretty gross.)
After your fake brains are in place, pour some Karo syrup blood around your fake wound (I assume you already have some fake blood mixed up), and you're good to go.
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