One of Seth Skorkowsky’s #GamemasterSins videos talks about kidnapping a PC and making the player suffer through not being able to do anything about it. I will admit to having done this once long ago (and never again).

However, I note with some amusement that it would very much NOT be a GM sin if the **character** is kidnapped when the **player** is not there. Well played @ariaflame, #WellPlayed INDEED. :)