Have some Quizzlestick, it's like a better conceived Numberwang.
[youtube]http://www.youtube.com/watch?v=CfgRGW9Ghik[/youtube]
[youtube]http://www.youtube.com/watch?v=rIjjWXstjZc[/youtube]
Along the same lines, but more scientific.
http://video.google.co.uk/videoplay?...q=water+rocket
[youtube]http://www.youtube.com/watch?v=67fFDiPRsrk[/youtube]
Bookmarks