The concept behind Thumbs and Ammo is fairly simple: Users remove guns from classic movie stills and replace them with a big thumbs up. Or, as the site explains it, "Real tough guys don't need guns, they just need a positive, can-do attitude."
Sure, there's a timely gun-policy statement in there somewhere. But mostly it's just hilarious:
Thumbs up, indeed! Check out tons more over at Thumbs and Ammo's site.