Make:

Larry writes "The silly, creepy, funny, weird, slightly haunted castle made _entirely_ out of balloons. In October 2004, this 60,000 balloon, 10,000 square foot, family friendly haunted house was built as a community project by 300 volunteers to raise money for cancer research. It was such a hit that it's being done again in Oct 2006 in a better location that can accomodate more visitors. Last time around, the 5000 visitors that attended each took a half hour tour through the castle where guides and actors told the story and pointed out the unusual creations made with an even more unusual material. This year, it will even involve balloonimatronic monsters." - Link.

Balloonimatronic!