Ok, so there I was in Cozumel on a cattle dive drifting peacefully along looking at all the pretty fish, turtles and alike. I check my gauges as I am prone to doing from time to time and I notice that I'm nearing the pressure at which I would typically turn a dive... I like to leave a small safety margin such that if there's any oddness that happens I won't drown, typically this means being on the surface with about 500psi in an AL80. So I signal to my Buddy that I'm low on air (the agreed upon turn signal) and he looks at me as if to say "***??" and signals that he'd prefer to give it a few more minutes. Now I'm the first to admit that I'm not the kind of guy that can breathe of an 80 all day long and still have gas for the next day of diving but give me a break, if someone calls a turn you turn and you don't give your buddy a hard time about it... maybe it's just me. Next time I'm bringing along my own buddy.