I made a pirate cake for my friend's son last year, and this year he's requested Batman. I happened to have a Batman cake pan, so I figured that'd be easy enough. Then she said there would probably be 40 people at the party, so I decided to make two Batman cakes and stack them like a layer cake. I've done it with my SpongeBob pan before. Turned out to be just EXACTLY enough. No leftovers!
Oddly, I've had the Batman pan for about 8 years now, and I've never made a Batman cake. I got the pan when my son was turning 6 and wanted a Bibleman cake. So, thank goodness I'd kept the instructions on how to make Batman.
I got TWO BIG HUGS from the adorable birthday boy, so I guess that means it was a success!