I can remember many a day that I wanted my serger to die a violent death. I put it on the shelf and forgot about it for 2 years and I started fixing up machines. One day I got it out to make some napkins (the only thing I do with it anymore) and figured out in 2 seconds that I had the wrong needles in it. It took plain jane universals and I had plain sergers in it (which someone sold me and was SURE it was the right needles).
Yup, needles get me every time.