I've decided that from January 1st, I'm only going to watch things that are 4K and above.
It's my New Year's resolution.
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Explanation
The humor comes from the double meaning of 'resolution.' It's both a commitment to do something differently and also a term for the sharpness of a visual display (like a TV or computer). The person pretends to make a New Year's resolution to watch only high-resolution content.