Country: Solomon Islands
If you sneeze, someone is speaking badly of you, cursing you, or bidding his personal ghost to eat you.Country: Nigeria
What to do after sneezing: Summon your own personal ghost to counter-attack the person who cursed you.1
If you sneeze, someone is calling for you, possibly with evil intent.Country: Greece
What to do after sneezing: Tell the sneeze that you are not the only person with your name, in the hope that the sneeze will move on to look for its real target - another individual who has the same name.2
If you sneeze, someone is talking about you, possibly someone who has cursed you by casting an evil eye on you.
What to do after sneezing: Spit thrice down your chest to ward off the effects of the evil eye. There are also ways to determine the identity of the person who was speaking of you.3