I asked for the can on a flight and the FA replied "we don't give out the cans, it's a single beverage service"... uhhh, it's a 3.5 hour flight.

Then on CO I didn't even ask and was given the can, and then a refill. Kind of struck me as odd. It was like the FA was bored and just went around refilling people's drinks, even if they didn't want it.