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And that reminds me of a very personal story when I was living in a block of flats in Puetto, Sardinia. We had a large Italian style bed, two sprung steel sets of bed springs supporting a large mattress, surrounded by a large wooden bed frame and headboard (not connected to each other). One night we got a little carried away and there was no way to stop the train. The large headboard had a mind of its own and was banging against the wall in a rhythmic motion, in time with the activity on the bed. The headboard surround was not dissimilar to the picture below.
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A few days later, while having a few convivial drinks with our downstairs neighbours, the neighbour's wife observed how nice it must be to have a husband like me. She commented how good I was to put up some shelves in the bedroom for extra storage as she clearly heard me banging away the other evening. Her husband and myself almost choked in our beer as we both knew better.