two is one and one is none
A Navy Seals adige meaning if you have two things and one breaks you always have one left but if you have one and it breaks, you have none
“I was in the water and my googles broke. Then I couldn’t stay down any more”
“Dude, two is one and one is none. What were you thinking?”
“Dude, two is one and one is none. What were you thinking?”