Idiotic thing to do in my view.
I did know someone who got caught in the act on a long haul. He was a desperate smoker and had equipped himself with a large plastic yogurt container and blu-tac which he had placed over the sensor in the ceiling.
It didn’t work…
A steward was waiting for him when he came out and he played the innocent whist said steward read the riot act. Apparently, apart from the well deserved bollocking he was let off with a warning.
Once back in his seat he remembered the yogurt pot which could prove enough pre-mediation on his part to change the steward’s mind. So he sweated it out until he could creep back in and retrieve it.
This was in the early days of the ban so I guess he got off lightly and nothing more was heard…