I borrowed some electronics from my Grandpa and thought I'd make a video of it.  I use a buzzer in it but I also have a doorbell, a light, and a motor. If you want to use the doorbell, just follow the instructions I give in the video.

 

We kept messing up on the magnetic nail so we just made a funny show. Enjoy! Remember this website IS NOT MADE BY SOUR PATCH

With a fan, you can show you how to keep a balloon in the air forever!  Even if the fan is sideways.

This is because of the force of the fan's air is hitting the balloon evenly on all sides.  So it stays in the air.  Watch how it works;