Maybe it's a very silly thing to be bothered by, but I can't be the only one agitated when I read a response to anything that begins simply with "This."
It's my personal feeling is that "This." is a sign of the decline of intelligent discourse on HN. I feel like "This." is usually karma fishing, and that their comment more than likely adds nothing to the discourse, and is often a predictor of immaturity.
I'd like to know what everyone else thinks.