The Big Bang Theory website provides: “Leonard and Sheldon are brilliant physicists – geniuses in the laboratory but socially challenged everywhere else.”
It seems someone that is brilliantly genius should be aware that car seat headrests should know their purpose:
National Highway Traffic Safety Administration safety standards that went into effect for the 2009 model year that were intended to help reduce whiplash injuries in rear-end collisions. The rule established a higher minimum height requirement for front seats and a requirement limiting the distance between the back of an occupant’s head and the head restraint.1
Yes, I understand they were removed for filming back seat passengers, but the message being put forth is diametrically opposed the intelligence quotient of the characters to whom it is being assigned.
1. Gorzelany, Jim; 2011; Forbes: Headrests At The Top Of Car Seat Problems