I remember walking into a side room in the NYNEX in Manchester at an all-nighter in 98 (New Order, Underworld Sasha etc) a sort of angular concrete brutalist construction underneath the arena, with huge silver air ducts, and AW was in there playing minimalist techno music that consisted purely of high speed drum beats, accompanied by strobe lights.
I lasted about 20 seconds before I had to walk out. It was too intense.