As a pilot and I was sitting near by and saw this happening I would
a) smile
b) think that's lad enjoy's his job.
c) h'mm this is a first a Greek with a sense of humour.
He is strapped in and next to the door so no safety issue. Showing good pax interaction and making the flight a memorable one for those customers. I am sure if anyone had been looking scared he would have stopped. But to be honest anyone seeing him do that would have probably been reassured that everything was normal if a bit bumpy.
No doubt though there will be some barbed wired wearing knickers bitch from hell CC manager who will stamp down on this outbreak of moral now its been highlighted on the internet.