Jeff Nusz of Custom-Logic built this pretty darn cool "cloth physics" simulator back in 2004. You can change the width and length of the cloth, and turn up the fan to watch it billow as if blown by the artificial wind.
http://www.custom-logic.com/work.html - Thanks Jon Jason!
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My mother had a solution for her roommates' food thievery in college (eons ago). She baked Ex-Lax brownies, put them in a container clearly labeled "[mom's name]'s brownies, for medical use only".
It was the last thing her roommates ever stole.
"put them [thin mints] in the freezer next time...unless you don't like having your MIND BLOWN!"
http://www.hulu.com/watch/144704/saturday-night-live-update-john-mulaney