They are professionals, I guess they can buy the most silent wheels possible for moving the walls. The portapotty can be also prepared with extra soundproofing in its walls. They start with unrolling a carpet, I think this is important, it can be some special thick carpet also to minimize noise from moving with the chairs. They are recording on an urban plaza with cars in the background the general noise of the city can also help.

Oh and you see only a handful of victims in the final video. It’s possible that they recorded it 100s of times and they only included the funniest 10 scenes in the final cut.

They have some behind the scenes videos where you can see how much work is to set up even the most basic pranks:

• www.youtube.com/watch?v=NWlaHYV6EAA
• www.youtube.com/watch?v=6M5Kj8K86wU
• www.youtube.com/watch?v=hAofPqr5sTA Here they show they had to stop a prank because they saw the victim was too distressed

I’m also fun at parties but because usually I consume a lot of coke