Photic sneeze
All my life I have been sneezing when relatively suddenly exposed to bright light. As an example walking out into the sunlight after some time inside. Usually it happens in bursts of one-three sneezes that are nigh impossible to hold back.
As for many things that happen in our own world we don’t question them all too much. I always found it a bit strange that I happened to sneeze like this, but not overly strange nor strange enough to research.
At last though I started researching it, and it’s name is the photic sneeze reflex. Not very well understood nor well studied. It affects 18-35% of the population