What causes sneezing when looking at bright lights?
I have never actually heard that before. Interesting. I have heard that when you see whales it makes you sneeze though.
The photic sneeze reflex (also known as photoptarmosis, colloquially known as "sun sneezing") is a condition of uncontrollable sneezing in response to numerous stimuli, such as looking at bright lights or periocular(surrounding the eyeball) injection. The condition affects 18--35% of the population, but its exact mechanism of action is not well understood.