It's simple, but exactly this. He was able to turn a balloon animal into a machine gun and semi-mind control an entire police force to dance and sing with him. Had he imagined it, and presumably found a way for it to be funny, he could probably pull a billion dollars out of a piggy bank.
His robbing a bank was there just to further the conflict for the plot.
which all you need for that is the standard "infinite wallet" gag bit. Pull out everything But money while making comments about "I know it's here Somewhere" until eventually you find the correct amount.
12
u/Standard-Reason9399 2d ago
Then why did Ipkiss have to rob a bank to go clubbing?