You may have heard of the demonstration of jamming a straw through a potato. It is a pretty popular science demo, but you can easily adapt it for a crowd.
http://www.abc.net.au/science/surfingscientist/pdf/teacher_demonstrations.pdf#search='straw%20through%20a%20potato'
Have a look at the site to get a good description. Two things:
1) you don't really need the gloves unless you are working with kids
2) make sure no one gets a hand or leg in the way of the straw as it is descending.
How I Would Use This
Commitment. Until we are truly committed we can't see how powerful we really are.
Potatoes are cheap and straws are pretty cheap. Don't use cheap straws. Buy a box from a fast food place or a restaurant and try this with a crowd.
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