If you've got a friendly chump's face like me, people will think you're an easy mark and come and try to befriend you with the intention of taking you on a free mini tour to their friend's shops so you can "Just look, not buy. No hassle my friend!" I fell for this once on my first night, and I genuinely thought he wanted a chat and to have a cup of tea with me! Should've listened when they told me "nothing's free".
Insider Tip:There are some strange quirks of Arabic that I picked up in Cairo. "No hassle" is Arabic for "I am going to hassle you for 5 hours buddy!" "Just look, not buy" means "I expect you to buy." "My Egyptian hospitality" means "My shrewd sense of business and trade turns this cup of tea into a transaction." "Welcome to Egypt" means "The tourist trade used to be a gold mine and you alone are going to pay for this 4 year drought that followed the revolution" All good fun really, Cairo is an awesome place to visit.