Shop Vac

I've got a wall mounted shop vacuumcleaner. Old beast, don't recall the name at the moment.
It's about the size of R2D2 and makes noise like there's a fighterjet powerbraking right before a fullblast take-off, about 10 feet away.

Turn it on and if you don't walk away quickly I'm sure there will be blood coming from your ears very quickly.

'Best' of all still.... it sucks big time...!