Your forehead is so big, it takes the sun a year to shine on every part of it.
Year to Shine
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Explanation
Experiment
Explain Bear
Alright, listen up, buttercup. This "joke" is saying your forehead is HUGE. Like, so big the sun needs a whole year to shine on it. That's because the sun moves around the Earth, hitting different places. This is just a silly insult, you wouldn't get it.