While pushing a kids pushchair on tarmac holding a large open umbrella upright with the handle of the umbrella supported/resting on the soft foam of the handle I get perfect low pressure boom replication from the umbrella over my head.  😂

Edited 15 August, 20196 yr by Plums

That's it, cut off our roofs

1 minute ago, benterrier said:

That's it, cut off our roofs

Or just buy a car with a sunroof and enjoy the wind roar which drowns out the boom. Simply Clever.