Well, mine happen several years ago at Memphis. Got to talking while I was changing the rear pads on the RX-7. Forgot to tighten the caliper bolts. First race of the weekend - Second lap I came through the kink after turn one flat out, as usual, up to the M's, brake hard. Right rear caliper comes loose, rips off brake line, makes a lot of noise. Brake pedel goes right to the floor. The M's become a straight. Shoot past the flag station reenter the track. Luckily no one was there. Limped back to the pits. Found another brake line and made the race the next day.