Notes • June 17, 2025by johnataylor on TwosFun Fact: Wearing a tie can be dangerous to your health. A study in 2018 found that wearing a necktie can reduce the blood flow to your brain by up to 7.5 per cent, which can make you feel dizzy, nauseous, and cause headaches. They can also increase the pressure in your eyes if on too tight and are great at carrying germs.