Board Thread:Questions and Answers/@comment-50.172.238.100-20170512164120

I am looking for the name or series/episode - I remember in the last scene, the box gets knocked to the floor (I seem to recall that was in Wayne Manner? maybe?) - anyway, the box is shown to only contain wires and sea-shells - Robin asked "how did that ever work?" (or something to that effect) to which Batman replied "It didn't work ... It was just an illusion"

Anyway, been looking for that episode for a while, figured why not ask...

TIA :) 