Poo-flinging catapults, though websites like SP have
probably hardened people to resist such
treatment . . .

v^2

Aside from a big pink rabbit suit that emits a sonic field that inspire abject fear, ("you ran away from that? you suck!") I'm not really sure if directly inspiring mockery is going work. Unless it was pig poop, which might be particularly effective in the middle east. (Gaaa... must treat post with seriousness it deserves...)

 

It would be nice to directly inspire mockery, but I think ultimately that if any weapon could be designed that was almost as effective as really shooting someone, yet almost as non-lethal as leaving them alone, it would allow our military forces to act with much less restraint, and much more success. Also, as the old saying goes, dead men tell no tales, but captives can be downright talkative. This would create further opportunities for success, and our success is their failure. Failure is the ultimate source of derision and humiliation.