First day of the semester, the shop teacher walks in and asks the class "does anyone know the difference between a nail, a screw, and a bolt?"
No-one puts their hand up.
"C'mon!" he says, "someone must know the difference!"
One girl timidly puts her hand up.
"Finally! Kathy, tell the rest of the class the difference between a nail, a screw, and a bolt".
"Well" she says, quietly. "I've never been bolted …"
Item 16770 are Fright Writes Pencils. The samples you provided have an eraser in the shape of either a black cat, a witch or a pumpkin. The pencils are painted with the word "boo," and are either black with cartoon ghosts or purple with jack-o'-lanterns.
Naturally there are exceptions to every rule as the Millwrights and Mechanics Guide 4th Edition observes: "These definitions obviously do not always apply, since bolts can be screwed into threaded holes and screws can be used with a nut." And several other examples come to mind: A toggle bolt consists of toggle wings, which is a special spring-loaded collapsible nut, and a screw--you always tighten the screw, but the assembly is called a toggle bolt. Stove bolts are essentially machine screws. Lag screws are sometimes called lag bolts. And fully-threaded cap screws are also called tap bolts.
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