is your patio being made up as a hillbilly shack?
if no then mabey you could do that and have a LARGE stuffed dog with a sound track of it barking and growling, have it activated by motion sensor or by the person who is shelling out.
if not the dog have an actor with a weapon of some sort, prop chainsaw, shotgun, what have you and have them jump out from behind a crate or barrel and yell something like "got ya'll now"
just my two cents
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