Of course, every once in a long while, you get something like this (source):
A 40-year-old man attempted to rob a Bank Hapoalim bank in Beit Shemesh on Monday, but failed due to the stubbornness of the bank teller.Yehuda
According to reports, the man gave the teller a note on which was written, "this is a robbery." When the teller refused to give the man money, the would-be robber fled the scene.
The man was arrested a short while later, and now remains in police custody.