Coleman Francis only had three films to his credit (The Skydivers, Night Train to Mundo Fine (a/k/a Red Zone Cuba) and The Beast of Yucca Flats), but he had his motifs. Mainly coffee. He was a fan of people drinking coffee. And it's hard to blame him for that. In fact, The Beast of Yucca Flats was Tor Johnson's last film, and Night Train to Mundo Fine had John Carradine. He also worked with his frequent partner Tony Cardozza.
He didn't do so well for himself; he ended up drinking himself to death, sadly, but he did make an appearance, as the last thing he did, in Beyond the Valley of the Dolls… unfortunately, as "Fat Drunk".