Nekkid dancin' around the stones is an activity I very considerately only ever carry out at the dead of night and very much alone... The sheep have got used to it and there are rarely any horses/small children around to scare.
It's safest that way.
Many years ago we did frighten the bejaysus out of a couple of girls who were cutting across the stones on their way back from the pub though... A couple of buds and I were sitting behind a stone, having a bit of a chat over a smoke, as y'do... we decided to head back to the motor and go climb Silbury Hill to wait for the sunrise... so we got up and walked round the stone... the poor lasses thought we were some sort of weirdy aparitions or summat! They screamed their heads off, bless 'em!
Must've looked a bit scary - 3 silhouettes rising through the dark and the mists - little me in the middle, wrapped in a blanket, flanked by 2 huge long-haired 6'+ dudes in greatcoats!