This prank is great for everyone! I got this idea from Ace Ventura: Pet Detective.
Step 1 Dress Up Like A Mail Man
The best dress up for this prank would be to look like a UPS or FedEx courier. Something people recognize.
Get A Cardboard Box
Write FRAGILE: GLASS or better yet get the stickers. Make sure it is all over the box so no matter who sees it, they can see FRAGILE. Also make sure to put something inside. You can put glass but it gets dangerous. Coins or steel beads in a plastic container work alright. Just find something you have around that you believe will make the best noise.
Step 3 The Prank
This is best done in a busy city, especially in a highly populated business center. My favorite is to go into one of those buildings with the multiple commercial suites that get a high flow of employees and customers. Now there are two ways you can do this: either be careless and throw it around like you just don't care or make it look like you accidentally dropped it and are now panicking. My favorite is always to do it in the elevator. Either do it like Ace Ventura - holding it and letting it get smashed by the doors. Or you can set the package down and act like you are tying your shoes. So simple but the faces you get are hilarious.