I wonder if it occurred to this guy that everyone reading his comment would have already read the original of the one he was screencapping. Why didn't he just respond within the thread of the original comment? Or star it? I guess he just felt that his exuberant reaction just could not be contained by a simple reply or star?

Screencapping just for the pleasure of a screencap within a screencap. In a way it's nice to see a guy feel a pointless post is redeemed and rendered personally meaningful to him by the simple acknowledgment that the post is pointless.