There is a folklore that says always crush egg shells,Why?

Answer 1

EGGSHELL, piercing or crushing
C.E. 77 PLINY Natural History XXVIII v
(1856, V 282) There is no one .. who does not dread being spell-bound by means of evil imprecations; and hence the practice, after eating eggs or snails, of immediately breaking the shells, or piercing them with the spoon. HOLLAND editorial note in Pliny's Natural History XXVIII v. Because afterwards no witches might pricke them [eggshells] with a needle in the name and behalfe

Answer 2

here is the folkfore

Be sure to crush the eggshells before you throw them on the compost pile so the witches don't use them for boats,

Answer 3

'cause witches come and find them
and sail away to sea,
And make a lot of misery
for mariners like me.

Answer 4

because they can make you a witchcraft of them,especially
if you trow them in the garbage,outside your home