When I tinker with my eyes, as in when I am trying to put on contact lenses, specially when it takes longer than usual and my eyes become watery, why does my nose start running too?
Why do I cough when digging in my ear using an ear stick?
Why does sneezing makes me momentarily deaf?
Why are there such strange connections between two unrelated parts of the body? What are other examples?
Edit 30/04/2010: See comments for some asnwers.