Rattlesnake Eggs In Envelope
Makes frightening noise when opened.
Pass out a small envelope that contains one dozen rattlesnake eggs. This is your best collection to show your friends but it is clearly labelled CAUTION - keep cool to prevent hatching.
Ask your friends to peek inside the envelope, hopefully they haven't hatched yet. With nervous anticipation they take a look and then scream as a frightening rattling noise comes from the envelope.
Simple fun and easy to perform - just add your own story. Can be used again and again and resets in seconds. No batteries required.