This is not uncommon.
This happens as a result of blood flow to tissue in the nasal passages that is very similar to erectile tissue in genitalia. Minute changes in stimulation as small as thinking about a fetish or seeing something arousing can set off a sneezing fit.
Ok so, this is something that I have found incredibly odd (disregarding the initial oddity of an inflation fetish), and I'm wondering if anyone else experiences this:
When I start thinking about inflation, I sneeze. Usually twice, sometimes three times. It happens perhaps 90% of the time, and it started several years ago, maybe a year after I first started getting into inflation. There is no possibility it is a coincidence. Thus, I am intrigued and curious to find out whether this happens to any of you guys. So if you feel like it, take mah poll, and if you have any explanation as to why this happens for me (or you), please venture it as I am irritatingly confused by this phenomenon. Tanks guise!