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 the ruler to bed?

He wanted to see how long he slept.

Why are you prodding me with that ruler?

Im measuring your patience

Shatter Jokes More Shatter Jokes

Why doesn't a window scream when you shatter it?

Because it's paneless.

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

Was there a ruler shattering epidemic that necessitated this