Shokran is the secret word to avoid the peddlers who are trying to annoy you in the streets, you can say it to the sellers trying to pull you to theirs shops to, it is the most polite and intelligent way to protect yourself from them,when you say that word, you will make them confused little bit, they will think that you are living in Egypt and knowing the right prices, so that he will not try to harass you anymore....

by the way, Shokran it is an Arabic word, means Thank you.......