I confess I love a waxwork scenario too. (I had half a Hardy Boys fic set in one, which was sadly lost in a harddrive crash) plus I sort of had an idea for a backstory to this piece, where the Joker kidnaps Robin at a fairground (natch) and takes him on a tied up tour through a Joker-twisted the Tunnel of Love (With some grisly Bats and Robin waxworks posed along the way) before dropping him in the prize machine as Bat-Bait