Another similar phenomenon is that bright light can cause a person to sneeze. There have been a few times where it has happened to me too, but usually bright light doesn't trigger sneezing for me. https://en.wikipedia.org/wiki/Photic_sneeze_reflex
I also have an incredibly specific form of synaesthesia (or something similar at least). I've never noticed it with anything else, but pinot grigio wines always 'taste' blue to me. It's difficult to describe, but it's just an instant sense of "this is what that shade of blue tastes like" and mentally seeing a flash of that colour.
Similar shade to this, but a tad darker: http://www.lcbo.com/content/dam/lcbo/products/084186.jpg/jcr...
I started doing this when I read about it somewhere, and I got the impression it's universal. I haven't experienced lights causing unwarranted sneezing though, but perhaps it's the same thing, only some are more sensitive than others.
https://en.wikipedia.org/wiki/Photic_sneeze_reflex
my entire family does it on my mom's side. when you tell it to someone who doesn't do it they think you are crazy.
I've heard that is true for 1 in 3 people. It actually has a reasonable explanation. The optic nerve bundle passes near the olfactory nerve bundle at some point. Its just signal cross talk. God's PCB designer having an off day.