"Hypermnesia" will allow you to convince even the most discerning audience that you have superhuman memory skills. The effect is perfect for any situation but we love performing it for friends. Here's how it goes...
You explain that you've memorised the phone numbers of every single contact in your phone book. To verify that it is, in fact, your phone book (it really is!), you can have a friend find their own phone number.
You instruct them to scroll through your phone book and select any other contact that they want. Immediately, you're able to recite their phone number. Then, you do it again, and again. You can also recall addresses, birthdays, and even wifi passwords! They can change their mind at any point and you can be stood on the other side of the room. There's no peeking or electronic transfer of information.
We've had the pleasure of using "Hypermnesia: for the past few months. It's ready to go at any time, it never fails, and it's totally fooling. For those reasons, and more, it gets our highest recommendation.