Why do ruler manufacturers make a big thing about them being shatterproof?

Was there a ruler shattering epidemic that necessitated this

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Ruler Jokes More Ruler Jokes

Why did the boy take a ruler to bed with him?

A: To see how long he slept.

Why did Princess Diana divorce Prince Charles?

She was always told a ruler was 12 inches!

Shatter Jokes More Shatter Jokes

What shatters faster than your smartphone screen?

A newborn with osteoporosis.

Why do ruler manufacturers make a big thing about them being shatterproof?

Was there a ruler shattering epidemic that necessitated this