When Concorde was doing its supersonic testing up and down the Irish Sea, concern was expressed by some bunch of god-botherers about the potential effect of the shock waves on some venerable god-shop or other in Cornwall. So it was decided that strain gauges would be installed in the steeple, to check whether the shock waves would affect the structure.
Come the day they sat there waiting; sure enough there was a muffled rumble and the strain gauge needles twitched. "Ah-hah", they said, "you see - it does affect the church!".
Then someone slammed the church door - and the needles pinged off-scale!