A brick.
If this one already made an appearance on here, I’m sorry. Just got reminded of it while thinking about idioms for hefty books, in english I couldn’t find any. In my first language we would say “it’s a brick”
Alt version of this joke:
What's red and good for a cop's teeth?
Correct! A brick!
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How often are bricks actually red?
Around here, always.
What’s yellow and can’t swim?
answer
An excavator.
That is an anti-joke, not a dad joke. But it is funny and tangential. I tell it frequently. Another:
What’s blue and tastes like red paint?
Blue paint.
What’s blue and bad for your teeth?
Answer
A really, really fast brick!
Explanation
The Doppler shift for fast moving objects moving towards the observerales them appear blue due to the shortening light wavelength.
Also bad for the entire earth, at that speed.
