The Beatles gambled away the proceeds from sales of their programmes as they waited to take the stage at Minnesota's Twins Stadium in 1965.
Ray Crump, the equipment manager for the venue's home baseball team, the Minnesota Twins, offered to send his "bat boys" into the arriving crowds to sell the 5,000 souvenirs Beatles manager Brian Epstein had asked him to shift.
In new film Beatles Stories, he recalls, "They (bat boys) came down, and they gave Brian Epstein the money and Brian gave the money to the Beatles and... they pulled out a roulette wheel (from their luggage) and they played with the money.
"They all got right into the game."