any advice would be helpful

[alphapiper1]

Hi everyone,
I am wanting to produce a small prop that fits in my mouth in the shape of a spider, where when I open my mouth, it expands and legs pop out. Do you think the form should be made of a foam expandable ball ? any ideas?
Thank you

[drfrightner]

Can you explain this a bit better because you really lost me. Larry

[alphapiper1]

Clarification

I guess what I mean is, when guests come through the haunt and see me in my mask, it would be sick if when I open my mouth, the legs of what appears to be a spider would emerge from my mouth