Phonebook Door Stop
Step 1: Find a phone book and lay it in front of you
Step 2:Take the top left hand corner of the next three pages and fold them into a triangle so the top left hand corner is now half way down the crease.
Step 3: Pull the remaining left side edge into the middle of the phone book and crease.
Step 4: Turn over the folded pages and repeat steps 2 and 3.
Step 5: Repeat step 2-4 until the phone book looks like this (Picture on left)