Returning from a sortie in the late 90's, one of my friends accidently went supersonic crossing the coast. Allegedly he knocked a house off its piles (I say allegedly because Im not sure we every coughed up any compensation!?)
Hence forth he assumed the nickname of "Boomer".
The is a quite frightening video of Concorde streaking past (5+miles away I guess?) one of those balloons attempting an around the world record at FL600'ish.
I think it was a publicity stunt (?) but quite obviously neither the pilots, organisers nor the balloonists had considered how dramatic the shockwave effect could/would be. The clip ends with significant screaming, swearing and shaking (and no doubt soiled undies as said balloonists scramble for their parachutes).
Thankfully all ended ok and the baloon stayed aloft.
I wonder if someone out there has a copy?