If you really want to pull the biggest prank on your friend, try this. What you will need to do is collect a whole bunch of purple m&ms. after youve collected a whole bag full of them, get a bag of M&M's and cut a small whole to empty all the m&ms, and put the purple m&ms in the bag. Gather your friends and cut the bag to act like youve just opened the bag. suddenly act sick and offer it to a friend. and then start a discussion about the purple m&ms and how you can win 1 million yen. youll have your friend really excited, and youll be laughing for a long time.