Premium Boss Black Coffee - Hot or Cold?

I posted about the beer I drank in Tokyo last week and I've covered a bunch of my trip to Tokyo Disney in various posts over the past few weeks, but this coffee experience seemed like it warranted it's own post.  Coffee? In a can?  That looks like a Mickey's bottle from my college days? Yeah.

We were there in Japan on-site working on a client project in a few of their facilities; one of them an office building and the other a more of an assembly or manufacturing plant.  That's where I came across this Premium Boss Black Coffee in a hand-grenade can.  It came out of a vending machine (I forget how many yen it was), but what was cool was that there were two options:  hot or cold.  You got, what I think is the same exact can and same exact coffee, only one of the cans was piping hot and the other was ice cold.  Pretty neat.