In the world of office and dorm pranks, none is quite as impressive as having a person open the door to his office or bedroom only to meet a deluge of balloons. Filling a room with balloons is not complicated, but there is a process that will make the job more feasible. This is a time-consuming project that can be sped up with a few helpers. Otherwise it may take you more time than the prank is worth.
Select a room with a door that opens outward if possible. Measure the length, width and height of the room in feet, then multiply the numbers together to achieve the cubic footage. This will give you a rough approximation of how many balloons to purchase, as each one will fill approximately one cubic foot of space. For example, a 10-by-10-foot space with an 8-foot ceiling will hold approximately 800 balloons if it is packed full, but 500-600 is more realistic to allow for some movement in the room.
Go into the room and close the door. You will need several hours without being disturbed, depending on the size of the room.
Place any fragile or breakable objects in a safe place, or remove them from the room completely. Do the same with sharp objects and small animals.
Place masking tape over any air vent knobs and other sharp objects that cannot be removed.
Slip the nipple of the first balloon over the nozzle of an air tank. Use regular air, which is safer in large quantities than helium. You don't want to asphyxiate the recipient of the joke if he starts popping the balloons.
Turn on the air until the balloon is completely full, then turn the air off and tie a knot in the nipple. There are balloon-tying tools that can help to speed this process, or you can do it by hand.
Place the balloon in the farthest corner from the door. If you have a helper, she can place the balloons while you inflate them.
Continue inflating balloons and stacking them in the far side of the room until the room is as full as you want.
Remove the air tank and any unfilled balloons from the room. Keep the door closed until the recipient opens it.
Tips & Warnings
- If you have two helpers, have one tie the balloon and the other place it while you inflate the next.
- Do not attempt to fill the balloons with lung power. There is a danger of passing out long before the room is full.
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