It's the Jizinski reflex. To check if it has caused permanent neurological damage, you must go to the nearest window when you are about to sneeze, press your naked breasts against the glass and see if you can cut through the glass with your hard nibblies.
Hi newly elected Premier Dalton McGuinty. Congratulations on your success I wish you the best of luck. I wanted to write to you today for one reason: My nipples get hard enough to cut glass whenever I sneeze in Ontario. I am a university student and have seen many changes in the social organization that have not been good for business or for the students during this academic year. The double cohort has ushered in a younger group of students who have not been able to take advantage of the many social opportunities inside and outside the university faculties all across Ontario because their nipples do not get hard when they sneeze. I ask you please in the best interests of business and students to reduce the age of glass-cutting nipples to 18 years of age. I am also starting an online petition. I hope we can work together in promoting freedom, business opportunities and a harder nipple environments for all students.