Hack sound activated prop to be motion dectected

That'll likely work. If you are so inclined, you can also "hack" a motion sensor light fixture to activate props without the whole powerstrip and DC adapter. Check this out:

AUTOMAT3D Blog Archive Motion Sensor Switched Output Hack

In a nut-shell, what it does is allow you to use the built-in relay to activate props without sending full "mains" power to it!

Mr Grimsley
I use these motion detectors. Flex ECT
They let you control how long to provide power down to the second and how long to go before activating again. I have four of them. I also use regular motion detectors from Home Depot that provide power to a wall wort outlet. If you use test mode, it only activates for 15 seconds. These are good for props that don't need control down to the exact second. I am good at hacking stuff but I don't want to unless I absolutely have to!!!!

hauntcrazy, I have four of the Flex ECT's also. They work great indoors, but I've found them to be very tempermental when I use them outside in the yard. Have you ever had any problems? I put them in plastic shoe boxes that I painted black, but they still seem to have a mind of thier own. Maybe it's a temperature thing?

I have heard it is a temperature thing. I live in Atlanta so I don't have much of a problem. Inside, they work like a charm. I don't do much outside anyway except for static tombstones and a few other things.