I've been bitten by the bug.
Colinette Jitterbug was one of my first yarn crushes. What's not to love? It has absolutely gorgeous color, it's bouncy and squishy, and it's sock yarn, so it doesn't actually count as stash. (Edit: according to my mother, sock yarn definitely counts as stash and perhaps I need to knit from the stash more and feed the stash less.)
I went through a period of about three years where I couldn't go into my favorite yarn store without buying at least on skein of this stuff. The only reason I can refrain now is that I have a handy mini stash of the stuff in my room and a really tight yarn budget.
Just look at that. Look at how the colors work together. The colors were what sold me on this yarn initially, and I had already amassed several skeins before I actually knit one up. That's when I found out how squishy and bouncy it is. I fell hard, and I fell fast.