Knowledge is like underwear. It is useful to have it, but not necessary to show it off. Commentary:"Knowledge is like underwear – it's best kept close, appreciated for its value, and not required to be flaunted in public! 🧠🩲 #SmartandClassy" Related Funny Quotes 🤝 Milk teeth are wasted on children. A new set of teeth would be a lot more useful when you’re older. Knowledge is knowing a tomato is a fruit; wisdom is not putting it in a fruit salad. I see people my age out there climbing mountains and skydiving, and here I am feeling good about myself because I got my leg through my underwear without losing my balance. Never understood why people train their dogs to sit pretty or roll over when there are useful tricks like empty the dishwasher or fold the laundry. I deliberately don’t go to bed early. I don’t want to look like I could be useful for anything the next day.