Spelling Errors and Wrong Notes
San Francisco, CA
A man walked into the downtown Bank of America and on the back of a deposit slip wrote, "this iz a stikkup. Put all your muny in this bag." While standing in line, waiting to give his note to the teller, the man began to worry that someone may have seen him write the note and might call the police before he could reach the teller. So, the criminal left the Bank of America and walked across to the street to Wells Fargo. After waiting in line for several minutes there, he handed his note to a tell her. After reading it, the teller determined that this robber was perhaps a few sandwiches short of a picnic. She told him that because his note was written on a Bank of America deposit slip, she could not honor his demand. He would either have to fill out a Wells Fargo withdrawal slip or go back to the Bank of America. Feeling defeated, the man said he understood and left. The Wells Fargo teller promptly called the police, who arrested the man a few minutes later--still waiting in line at the Bank of America.

FBI Lunch break
Boston, Massachusetts
An "Einstein protege" had been casing a Boston bank for several days, waiting for just the right moment to commit robbery. He went through the customer line, and as he approached up to the teller's window, he produced a handgun and announced in a very loudly "THIS IS A HOLDUP, NOBODY MOVE!" Much to his dismay, the next five customers were armed FBI agents on their lunch breaks, attempting to cash their checks. The quickly surrendered with no shots fired. His "genius" casing job had failed to notice the FBI Field Office two doors down.

One Way
United Kingdom
Some videos recently were seen where robbers did not realize that the bank door opens one way. So on the raising of the safety screens they assumed that the doors locked too, until the next customer walks in unexpectedly. (One guy was seen to shoulder barge the door in desperation for 2 minutes).

Biggest Bank Robbery In Britain
Britain
In the trial of six men charged with attempting Britain's biggest cash robbery, prosecuting attorney Guy Boney told the court that the group forced an armored car, carrying over 18 million dollars, into a wooded area. The sextet then used high-powered torches to open it. Boney also noted that the torches set off "a horrendously expensive bonfire" that turned over 2 million dollars into ashes, causing the men to flee.

Waiting
Unknown
This man cavalierly went to the bank and stood in line just as any other customer would. As he got closer to the teller, he pulled out a ski mask and a gun. He then waited in line for several more minutes so that he could rob the bank.