During class, one of my students pointed this toy crossbow directly at my eye at point-blank range. I'm sure he meant well with this warm gesture of marksmanship, but I necessarily confiscated his toy anyway.
I'm not sure about other teachers out there, but I've seen an panoply of impressive arms born by my students, particularly the boys. My boys have brought in BB guns, arm-length toy M16 rifles and even tree branches sharpened and carved into the shape of a machine gun.
Also, it's surprising that many students have retractable razor blades in their cutesy, unassuming pencil cases. Whenever I hear the clicking sound of the blade extending, I know some shit's about to crack.