Optimist: The cup is half full
Pessimist: The cup is half empty
Radio astronomer: The cup adds 5 kelvins to the system temperature...can we make it out of teflon? Maybe drill a few holes in it? And get rid of the water?
Optimist: The cup is half full
Pessimist: The cup is half empty
Cosmologist: The cup is dusty or full of gravitational waves

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