"Hi Diddle Riddle"
After Riddler captures Robin, he ties him down to a table in his hideout, with his head in a vice. Riddler asks for a scalpel, but then throws it down, and proceeds to slowly tighten the vise holding Robin's head. What is he going to do?
"Is this the ghastly end of our dynamic duo?"
It turns out Riddler was only using the vice to hold Robin's head still so he could make a mask of his face. He is later rescued by Batman.
A female in the Batcave?