Answer:
Whipping one of these out in the wrong setting is said to be terrible luck.
The buyer doesn’t want it, the producer doesn’t need it and the user doesn’t know their using it.
What's that 7 letter word with thousands of letters in it?
An image taken from real life
What do you have in December that you don't have in any other month?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.