Why is your forehead so shiny? Did somebody laminate you? You're so shiny, Mulan can look into your forehead and sing "Reflection."
Shiny Forehead
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Explanation
Experiment
Explain Bear
Listen up, buttercup. The joke is all about how shiny your forehead is. Like, so shiny that Mulan could use it as a mirror to sing her song, "Reflection." You know, 'cause Mulan looks at her reflection in the movie? But instead of water, it's your giant shiny forehead. It's funny because it's insulting, and you're probably insecure about your shiny forehead now.