I did pretty much what you did Damien.
During the day I built a sand pit for my Grandson, about 300mm high and filled it with lovely sand.
That night i was at the Observatory in the back yard and was finished for the night carrying home my 50mm lens in my hand.
As you I had forgotten about the recent sandpit build and in the pitch black walked straight into it.
Well the lens left my hand and flew over the assembly and i landed in it, a few chosen words later and all was well other than feeling a bit stupid there were no injuries, oh, and the lens cleared the lot and landed on the soft lawn, it too was fine.
Can laugh about it now.
Leon