Ken Habarta has a collection of notes written by unarmed bank robbers. They range from the polite and apologetic,

Please place all the money on the counter. No (dye) packs or tricks. I am armed. Thank you! I’m sorry!

To the blunt,

I have a bomb, put all your money on the counter.

And grandiose,

You have 15 seconds to put at least $9,000 in $100s & $50s in front of me. Alarms, dye packs, bait money, tracking devices, or follow me out, will equal death. My briefcase will inflict a deadly wrath on all of you in this bank if you follow me. Time starts now!

Others attempt emotional blackmail,  

Give me money or I will blow up a school.

This example, written by Mr Kevin Pinto, may seem unremarkable,  

This is a holdup. Give me 100s, 50s, 20s. Hurry up.

However, the “hurry up” has an almost comedic aspect given that Mr Pinto, who robbed ten banks over a period of six years, committed each robbery during his lunch break. Pinto was employed as a financial compliance officer by the investment firm Paradigm Capital. He was sentenced to six years in prison.

Ken Habarta’s book Bank Notes may also be of interest. Apparently Tuesday and Thursday mornings are popular robbery times. Via Coudal.