Every word in every language started out as gibberish until one person convinced enough people what they said was a real word.
Every spring our bodies, the result of billions of years of evolution completely freak out because flowers are having sex.
Storm Trooper armor is pretty useless. One hit from a blaster and they go down. They might as well just wear normal, lighter, clothing.
For how commonly red and blue are used to represent hot and cold, you never see purple to represent the middle