Why? What story did I miss?
Couple of years back, this character joins the forum - claimed all sorts of military qualifications and experience, none of which was true. To top it all off, he spoke with the authority of God, and God help you if you disagreed on his choice of tactics or weapons - he could be very insulting and argumentative, and not in a good way. One of his more unusual ideas was the assault wheelbarrow. That and his TEOTWAWKI plan to float down the Mississippi offering his services to the highest bidder.
Turns out he had quite a reputation on other forums. He would join and raise all kinds of hell. Last I heard of him, the cops were looking for him for appropriating some of his ex-wife's firearms. IIRC, he came to my attention on a Stolen Valor thread here. So now, every time someone comes up with a seemingly wildly impractical or downright goofy idea, this character pops into my head.
Not that a slingshot cannon is one of these - I can see applications in a mass rioting situation as a large, non-firearm launcher for smoke grenades, noxious items, rocks, what have you, and the smaller one reminds me of a wine bottle cork launching crossbow that the Quark got on his last trip to France. Needless to say, he and his sister Quirk are enough to insure an excellent supply of ammo..... Matter of fact, it gave me some ideas......