Smoking
I have just returned from Spain. On my outward flight there was a nutcase passenger. Soon after the meal service had been cleared in he took a packet of cigarettes from his bag and selected an artificial one. He sucked on it and the tip glowed red and it smelt of tobacco. It was spotted by a very vigilant cabin crew within 15 seconds. He explained that it was a joke and was nevertheless instructed not to do it ever again. The stewardess concerned then went to the galley. About a minute later he started the same ruse again. Within 10 seconds he was spotted by the No. 1 stewardess. She instructed him to put it out. He explained again that it was a toy. She told him that that did not matter. Smoking in any form was prohibited. He was very indignant about it all and said again that it was a joke.
When the aircraft arrived in Spain he was instructed not to leave the aircraft until the captain had met with him. He was told in my hearing that the airline intended to ban him from flying with them ever again.
I thought that the cabin crew handled an unnecesary and frankly pathetic situation very well. Anyone who chooses such an absurd prank on an aircraft needs mental treatment.