Fear Factor B-Day Party For 6 Yr Olds

I am having a fear factor party for my to be 6 yr old (boy) in March. March is a very unpredictable month for weather so I need to do all activies inside. We will have the party for 2 to 3 hours depending on what we plan. Any ideas for 6 yr olds. Not to gross, but gross enough. Thanks
Posted by Amber; updated 09/05/06