smoking pot
I very close friend had the Rolling Stones on a flight from Miami to LA and when it was noticed that pot smoking was going on, he landed in Houston advising the passengers it was the end of the road.
Pilots having this in their blood is definitely irresponsible and say good buy to insurance when you run off the runway on arrival.
A conversation followed with MJ and the Captain which ended in a very professional apology by MJ and assurances that this activity would no longer take place.
The Captain submitted a plan and they continued to LA. At the end of the flight there was a final apology by MJ for the hassle and appreciation that the captain got them to LA .
Its not how you behave, its how you deal with it when confronted by others for an explanation. That's when you find out their attitude.