Because... oh jeez. How do I even explain this? It's pretty much a symbol of everything I love about QAF - namely, the fact that this goddamn show breaks my heart with so many episodes, and yet makes me sigh because of the pure romance of it all. Take 314 as an example (I'm fairly sure we talked about this when we marathoned it) - that episode is everyone's happy place, but it always makes me come close to crying because of Ted and Emmett's storyline. But that's why I love the show; it gives me a thousand conflicting emotions, and I care enough about the characters to cry for them.
The scarf symbolises all of that to me. I can't see it without getting a lump in my throat, thinking of it covered in blood and Brian holding onto it, but I also can't help thinking of Justin's face when Brian walks into the room and the way Brian puts it around Justin's neck. That's usually when I start tearing up - tears of happiness, but also tears because I know what's coming next. It's that conflicting emotion that grabs me.
Also, on my very shallow note, it's a pretty scarf. If I hadn't watched the show and I saw it in a shop, I'd buy it. It's got that soft, flowing, elegant look that is what made me fall in love with scarves in the first place.
Uh. This ended up a whole lot longer than I thought it would. Whoops.