Watched Concorde taking off from 27R once and as it the sound of it slowly (or very slowly!) faded into the distance the sound of about 60 car alarms going off in the Long Stay Car Park could be heard!
Concorde departures set off car alarms in the staff car park at the end of 27R on every departure. The car park staff used to have a nice little side-line in jump starting flat car batteries at a tenner a time. Mine went flat after a ten day trip. I purchased one of those solar plug in chargers after that.