Variations on the "half full/half empty" argument:
Optimist: The glass is half full
Pessimist: The glass is half empty
Engineer: The glass is twice as big as it needs to be
Accountant: Does that glass really need all that water?
Quantum Physicist: The glass has a 50% probability of holding water
Philosopher: If no-one looks at the glass, who's to say how full or empty it is?
Matter of perspective: Half empty or half full? Depends on if you're drinking or pouring.
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