Big Kid has Photic Sneeze Reflex. I recently accidentally came across something on this and was amused to see that there was a name for it.
He sneezes almost every single time he walks out of a dim room into bright light. He has done it since birth--he even sneezed as we first walked out of the hospital with him.
It makes us all laugh every time because it is so predictable.
If I ask him a question as it is about to happen, it stops him from sneezing and leaves him with that awful, unsatisfied, need-to-sneeze feeling, and it's pretty much become a family habit to give Big Kid a minute any time we've stepped into the sun.
I see that there's a support group for it...how bizarre. He'll love that when he's older, little symptom-dramatizer that he is.