<a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Whipcracking" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Whipcracking</a><p>&quot;The crack a whip makes is produced when a section of the whip moves faster than the speed of sound creating a small sonic boom.&quot;<p>(I agree that is a strangely satisfying thing. It does make hanging the wash up for drying slightly less tedious...)