Good points. Caused me to do some additional research (beyond my personal experience with hats).
Patents for headrests were granted in 1921, 1930 and 1950. [1] According to some sources, they began to appear in cars in the 50s and 60s [2], which coincides with (and slightly pre-dates) the JFK theory.
Patents for headrests were granted in 1921, 1930 and 1950. [1] According to some sources, they began to appear in cars in the 50s and 60s [2], which coincides with (and slightly pre-dates) the JFK theory.
1: http://en.wikipedia.org/wiki/Head_restraint 2: http://www.ehow.com/facts_7597635_use-headrest.html