Humphrey was born in Dubrovnik, Croatia, in a family of Circus performers. His father was a wild animals trainer.
Humphrey started to learn his father's job when he was 12 years old and loved that. Unfortunately, he was allergic to tigers and panthers and couldn't help sneezing on the stage, so he had to choose other wild animals to train. He chose ducks.
He worked hard and made up a very impressive performance, involving a duck, a saucepan and a card game.
The duck had to jump in the saucepan, and play poker with its nozzle. The animal was so well trained that it became a very good poker player.
Humphrey decided to leave the circus and to start an activity of professional poker player with his duck.
The duck was not interested in money and agreed to leave the Circus and play poker professionally only if Humphrey promised to sing a song after each betting round. Humphrey agreed.
They moved to Las Vegas and earned a lot of money gambling together at the Bellagio Casino.