Reminds me of this old movie I saw years ago.
BUG.
http://www.imdb.com/title/tt0072750/?ref_=fn_tt_tt_3
Info; This was the last film by director William Castle. Castle wanted to install little sweeping brushes in the theatre rows, to brush the legs of the movie watchers, and simulate the crawling advance of the mutant roaches, but it surprisingly, it was turned down.