Not Exclusive To Grapefruits (Or That's The Same Color As My Favorite Shirt)
Everybody knows and accepts that grapefruits come in both yellow and pink. However, whenever I bring up pink lemons, people will deny they exist. I respond with, "What do you think they use to make pink lemonade?" to which they respond some quote containing the usage of food coloring. Why are people so stupid as to deny that lemons come in pink? Don't believe me? Take a look:
http://i20.photobucket.com/albums/b2...PinkLemons.gif
There. Some pink lemons. It only makes sense that lemons would come in pink if grapefruits do, anyway. I saw my first pink lemon when I was nine or ten years old, yet some 90-year-olds have never seen one.
So, topic is this:
Are there any completely obvious truths that you know that everyone to whom you ever speak denies or accuses you of lying or being stupid when you bring it up? You know. Stuff that you thought everyone knew, but it turned out everyone but you denies.