Well, it’s certainly not a concealed weapon
A small trebuchet launches a water ballon across the Llewellyn schoolyard and into an unseen mob of children. Unlike most sieges, this mob of children was actually trying to get into range of the engine.
Some of the blurriness of this image is because the end of the lever was moving quite quickly (the bigger copy of the photo shows the water balloon streaking off into the sky) but, alas, most of the blurriness is because my vision – and eyeglasses prescription – is terrible.