Gotta love the Dollar Tree...they sell a lot of annoying stuff my kids' grandparents love to buy them. This time of year there is no shortage of these cheap motion activated witches, ghosts, skeletons, etc.
Got me thinking...you can probably short the motion trigger (circled in red in the picture) and basically have an annoying sound effect playing on loop with the flip of a switch in a relatively small package. Then add it to a "I really don't want to lose this rocket in tall grass/corn" scenario. Also it has an RGB flashing LED to make for more effects on a night launch or night time search and rescue. Pulled out of the base of the witch pictured below it weighs about 16g. Would certainly fit in a BT-55 and above and could easily be tied to the parachute recovery line. The circuit board is screwed into the housing and secures the batteries below it.