While their housemate was out of town, two guys inflated 2,269 balloons and entirely filled his bedroom with them. It took them three and a half weeks, but it was completely worth it for his reaction.

Holy fucksticks, indeed.

Although they joke in the video that what to do with all the balloons is their housemate's problem, they did actually help him clean up—using these spiky sticks they rigged up with some tape and nails:

[H/T Reddit]