In a study published in Neuroradiology, German doctors conducted a study on the effects of wearing restrictive neckties on the blood flow in the brain. The study recruited 30 healthy young men and put them into two groups. One group had to wear a tightly tied tie, while the other served as a control group chilling in open-collared shirts like a bunch of common drug kingpins. Through MRI scanning, the researchers noticed that, on average, wearing a buttoned-up shirt with a tie reduced the amount of blood going to the brain by a staggering 7.5 percent. Even more jarring, after the subjects got to pop their top buttons and loosen their ties, their blood flow still kept declining by as much as 12.8 percent. So even that cool "I just got off work" look you sport during after-hour drinks isn't helping you sound any smarter.