Knitter 1 to Knitter 2: Hey! You're dropping your balls!
I think this is one of my favorites! It just so happens to be one of my last overhearings though. If you hear anything in a yarn shop, or even outside of a yarn shop that's knitting related, submit it to overheardinayarnshop(at)gmail(dot)com.
Seriously...I'm way hardup for material here and in order to keep the site going, I need submissions.