Just a little something I'd like to try..
Lock me into a cock cage with the brand new, unopened, padlock I've brought.
One key goes into an envelope which you have me address and seal. The other key(s) you keep. Or maybe we destroy.
Then off we go for a walk down to the local postbox where you have me post the key.
I wonder where we'll send it....
Extreme version of the game... we spend the afternoon finding interesting places to dispose of all the keys.. recycling bins.. rivers.. etc..
Just how will I get out now!