We used to get earthworms for fishing and bugs out of the ground by making noise. Stick a pitchfork or shovel into the ground and move it back and forth. It works better if you have rocks to scrape against. In about a minute everything below comes to the surface and you can pick it up.

Since you are in cups I'd suggest taking them outside and setting them on the ground.  Do the pitchfork trick on the ground and I bet enough sound will come up through the bottom of the cups to scare them up.

Another alternitave is put them on your stereo speaker and crank ACDC up to 10.