I have always thought it would be neat to restrain a fellow securely before having a few friends over on a cold winter night.  He would be secured by the front door and well blindfolded so that he could hear the door open and feel the cold air when they come in from outside but still never have any idea who was there.  Then as their door prize they get to do something to him of their choice.  He has no idea who is doing what to him.  This would not work well as an afterthought and it would be suggested that the guests know in advance of this option and that they remain quiet during their play session with him so he remains totally in the dark about who has him right then.  Just a suggestion.