Ben and Joe have taken a liking to Batman and all things Batman related.
This fascination came about in the last 4 months or so after they watched the Batman movie.
In their mind, this is the (only) Batman movie:
Batman: The Movie; copyright 1966.
Reminds me of my youthful days enjoying Batman. Reruns used to show on "The Family Channel" growing up. Somewhere in the 4th-6th grade range, my good friend John Juvan and I used to play Batman & Robin. We would hide in a small room or closet (some "secret" place) and pretend it was the Batcave. I made a Batcomputer out of cardboard.
I was usually Robin.
Fun to see the enjoyment being passed down to the next generation.
See how much you can interpret!