Manly Beach, Sydney.
Being carried, not ridden.
I had previously seen an odd contraption on the side of a parked bicycle, all mysterious frame and straps, and the McSnaffle Mind had boggled trying to determine its purpose.
It was only later, strolling cheerfully along Manly Beach - the sounds of the NAB Beachley Classic receeding behind me - that I saw a young woman cycling along with her surfboard attached to the side of the bicycle with what were basically enormous stretchy bungees, that the pieces fell into place.
The mind is an ingenious device, if a little hard to look at.