(at least at my bank)
I went to the ATM yesterday and I only wanted $10. When the ATM kicked into gear nothing came out and it went through the cycle 3 times before it gave me $5. The receipt also showed my balance at -$10 instead of -$5.
So I tried to call the bank but they were closed. The lobby was already closed. Then I remembered that the drive thru was open so I went to the window. She looked up my account and assured me that the balance was correct - it was showing -$5 by this time. I guess it needed a few minutes to correct itself.
So, all was well.