Usually Bless you.
I just say "Bless you" and sometimes "Turn your damn head!".
In Bulgarian we actually say cheers for some reason.
I say G'bless you or Ka-bless you because thats what I thought it was as a kid...you know kinda like...kaboom?
I say Santinho, which is the equivalent of Bless You. But the literal translation of Santinho is actually the diminutive form of "Holy".