One for a wish, two for a kiss, three for a letter and four for something better!

The irish "capall bán fút" (a white horse under you) may refer to the white horses that pull hearses. After four sneezes, you are going to die!

In ireland you might hear "Deiseal!"- may things be right with you. Deiseal is clockwise, with the sun, right and correct.

Please ignore much of Englishrevered's comments, they are not serious and are sarcastic.

Englishreverend is our friendly neighborhood troll otherwise known as Steveh. He has many different accounts. Like Gillian said, trolls are never to be taken seriously. 

I heard that we say God Bless You because in the old days they thought that your soul could be vulnerable to being taken over by an evil spirit at that moment. That's what I heard anyway. I like the saying though as I usually like being blessed by others. :D