Oh dear!
It’s making fun of engineers who are always keen to make things as practical as possible! So the famous saying about optimists and pessimists and the 1/2 full glass of water being considered in different ways is twisted to say ‘well why is the glass so big if you only need a little water?!’
I hope that makes more sense 🙂
Another joke I like is
‘What’s brown and sticky?’
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