sneezing in the sun
2014-08-29azim58 - sneezing in the sun
video about why 1/3 of the human population sneezes in the sun
http://www.stuffyoushouldknow.com/video/clips/sneezing-at-the-sun-dont-be-d
umb/mkcpgn=em2
Basically in some people the trigeminal nerve is near the optic nerve.