HOW TO – Make an erupting volcano birthday cake

Dave writes in –

For my son’s 5th birthday, I decided to go a little nuts. 4 months and about $200.00 later I think I created something one of a kind.

I wanted a volcano that would do several things…

• smoke
• erupt with lava
• vibrate
• and finally, make volcano noises.

instructables : erupting volcano birthday cake – Link.