In some cultures, there is a belief that sneezing is caused because somebody is thinking of you. After one sneezes, somebody says a random number, say 1261. If you add the numbers together, 1+2+6+1 the sum is 10. The number 10 corresponds to the 10th letter in the alphabet, that is, J. Then everybody starts to guess who could it be: Jane, James, Jean, Jeremy, etc.
This app makes a random guess and then determines the letter. Then it opens your contacts and presents you with possible names of people that could have thought of you.