As Joerg points out, toilet brushes tipped with nine inch nails are a much-beloved form of ammo on the Slingshot Channel. But the old toilet brush crossbows didn't really have a sighting system. So Joerg got serious and created a toilet brush sniper rifle, complete with telescopic sight, that can shoot with precision from 22 yards.
The brushes plowed through 10mm plywood board and went 4 inches into the archery mat behind. They also went through 1.5 inch oak plank. This is one of Joerg's more bizarre inventions, but it's pretty amazing to see how much he can hone concepts based on seemingly impractical materials like toilet brushes.