I'd like to think most of us are not, but am sure we have all stood in line behind someone just like this. It ranks right up there with standing behind someone in a long line, who finally reaches the counter and is still contemplating what to order!
I'd say proper use of a sample, in this case, would be to choose between X and Y...not to eat half a cone as you sample your way through 31 flavors. And I'll bet we're all in agreement here. But this is a funny clip just the same.