Blood and sand, that's *$%^ loud! Some things in my life were almost worth the historic hearing damage, like seeing Led Zeppelin and standing behind Read and Bonera's MV 500s as they were warmed up before Mallory Park's Race of the Year.
I once had to take a works RC45 Superbike, which we had just put back together, down to a dyno in the paddock at Donington Park, and stand with it while it was run up to full bannanas to check all was well. That was quite something, though not ear splitting like the one in the video.