Even though the plastic or latex is crumbled away to almost nothing, I roll it up, the hair looks like hair and I bend down reaching around the corner over a illuminated floor register(for display no heatwork) as they walk toward me I slightly move it out over the register then only move it ever so slightly until they get close, then I make it "run" up the corner very quickly!
Quite good reactions from most people result.
A ball of grey lint from the clothes dryer makes a good "Mouse" too.