In Greek superstition if you sneeze it is believed that somebody is talking about you.  Since you do not know who the person is you may try to figure out by saying out peoples names.  If you say a name and you stop sneezing it is thought that that is the person who is talking about you.

Another way to find out who is talking about you is asking someone for a three digit number.  You then add the three digits together and come out with another number.  Using the final number you count down from the start of the alphabet.  The number you get must be less then or equal to the maximum characters in your alphabet, in the Greek Alphabet this is 24, in the English 26. If it is more you count the numbers together once again to find a smaller number.  The letter the number falls on is the first letter of the name of the person that is talking about you.

Two examples: (With any two numbers you will get the first circumstance (most likely), and rarely will you use the second.)

For the number 333. Add it together 3+3+3=9 . Now count down to ninth letter which is "I". The person who is talking about you is thought to have a name beginning with "I".

For the number 999. Add it together 9+9+9=27. In the English Alphabet there is only 26 characters so we add 2+7 together and get "9".  Now count down to ninth letter which is "I". The person who is talking about you is thought to have a name beginning with "I".

As you do not know who is talking about you, the person who believes this superstition may spit down three times on their chest to avoid something bad occurring to them via The Evil Eye.  The use of the number three in all the above has to do with the holy trinity, and using it to help you both know who is talking about you as well as safeguard you.