World's Scariest Gadget

From the website:

Motion-Activated Recording Speaker

Motion-activated gadget can be placed out of sight to startle, prank and scare your friends with your own recorded noises and phrases.

Also great for more practical uses.

Versatile unit features 10-second sound recorder, built-in microphone and speaker, motion sensor, line-out jack and swivel mounting bracket.

Requires 4 AA batteries (not included).

5" x 3.5" x 1.5".

$19.98.