I worry about the knitting and accessories I carry when I pack for TSA. Stephanie has a great way of putting it... see her blog.
On the other hand, I could never assume that my proximity to anyone on a plane would elicit a conversation longer than, "What are you making?" Seldom will anyone venture a stab at naming the craft. And when I answer, "Socks," the follow up question is, "Who are they for?" Clearly the eyebrow raising in response means I have hours of no conversation ahead, and I can continue with my complicated chart pattern. Adults don't wear socks...(?)
My carry-on bag was re-scanned to get a better look under my yarn jar. I love my yarn jar.