From the cliffhanger to the Impractical Joker / The Joker's Provokers pair of episodes of Batman.  The Joker locks Robin in a wax spray booth and turns him into a wax figure.  

“First, a wax spray job, somewhat similar to what you get when you have the Batmobile washed. It takes a week or so for the wax to harden properly.

"Start with a light spray.  When every pore in his body is filled with wax,  we'll apply a heavier coating.”