On what Juju mentioned...I'm actually one of the 30% (I think that's the figure) for whom a light source (such as the sun) actually induces a sneeze..is anyone else here like that?
Other methods for preventing a sneeze I've found is to rub your nose a little bit...or if it's really early on in the sneeze and someone quickly says "Bless you"..that's it..they cancelled your sneeze. Those Bastards!