Sneeze Priest
A random person who says "God Bless You" when you sneeze but seldom goes to church and is not really religous. This forces you to acknoledge them or give the sign of the cross.
After sneezing in a public place, a stranger says "God Bless You" and looks at you with an expectaion of a thank you. Your friend says "who was that?" and you reply "I have no idea, he must be the local Sneeze Priest!"