"Caught In The Spider's Den"
Black Widow reverses the polarity on her short-circuiting device and uses it on Batman. Unable to make decisions, he helps her find another bank to rob at her request. She then disguises herself and a dummy as Batman and Robin, and borrows the Batmobile to rob the new bank.
Commissioner Gordon puts out an alert on the Dynamic Duo, and an officer shoots the dummy Batman when he spots him on the street. Luckily, Robin is able to restore Batman's brain functions.
Batman sings 'Little Buttercup' to Robin when his brain is short-circuited.
Eaten by spiders? This could take a while...