I don’t know if other goldens or dogs do this – but mine like to chase their tails, upside down.
A demonstration:
She gets into position, twists head and wags tail to the same side, misses, relaxes and then tries on the other side – and succeeds! then relax and celebrate.
Nina's Garden 
Crazy! My 3 Golden Retrievers also do this on the tiled conservatory floor…they love it. Merlin (our boy) will sometimes fall asleep in this position. What they are actually doing is scratching but it is quite entertaining to watch.