So I read this article...
http://www.engadget.com/2006/09/13/air-force-chief-proposes-testing-pain-guns-on-unruly-americans/ Then it made me think of a (probably not-so) sci-fi weapon--the ELF Bowel Distender. The ELF (Extremely Low Frequency) is a weapon that emits extremely low frequency sound waves that would potentially rumble the bowels of your opponents. The result would be an embarrassing and unceremonious crapping of their pants. Apparently, nothing takes the fight out of a soldier more than dirtying their drawers in battle...