At pay phones
In shopping carts
In clothes pockets in stores
In letters to loved ones
With a generous tip
On seats in restaurant lobbies
With fast-food employees, cashiers, and gas station workers
In restrooms
At rest areas
On ATM machines and bank counters
In envelopes with bill payments
In elevators
On hotel dressers for the maid
On ice machines
On newspaper racks
In waiting rooms of doctors’ offices and hospitals
On seats at airports, subways, and bus stations
With flight attendants and cab drivers
In plane seat pockets
Inside magazines
In cabs
In laundromats