Frustration is binding off the collar of a sweater, leaving only the sleeve seaming before it's finished, only to find that you dropped two stitches down near the bottom.
Complete irritation is starting to fix the dropped stitches and dropping five more stitches on the collar in the process.
I'm giving up tonight, I'll try again tomorrow.
(Even so, I'm stoked that I might be able to wear "Ridiculously Pink" by this weekend. Then it's onto either Coachella from Knitty or the bamboo creation whose details are currently being worked out.)