Did the Klingons evolve those ridged foreheads since they liked to bang their heads against eachother in interstellar pubs throughout the universe over generations, or did they get ridged foreheads because of sudden mutations or something, and then - after realizing the power and durability of ridged foreheads - started to bang their heads against eachother in interstellar pubs throughout the universe for social or other non-genetic reasons???
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