It seems that we're getting a break from the "Weird Batman" period with Detective Comics #291:
Oh, good. Some old school patrolling Gotham City. Perhaps they'll come upon a burglary, or help police stop a bank robbery.
Okay, no one panic! It's probably just some time capsule that has mementos from the turn of the century!
It could just be a big snake! Maybe a big snake got in and was sleeping there or laying eggs or something! Snakes lay eggs, don't they?
Let's try it again tomorrow!