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 do blondes put rulers on their foreheads?

A: They want to measure their intelligence.

Why did the girl take a ruler to bed?

She wanted to see how long she slept.

Shatter Jokes More Shatter Jokes

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

Was there a ruler shattering epidemic that necessitated this

What happened to the little Dutch boy after he put his finger in the dyke?

she shattered his jaw!