Like this "little" hole that my dear son poked through the Icosa Welt Ball I knit a couple of years back. This "impressive" project was quite a lot of work and it looks really darned cool. It also gets a lot of attention from my kids. Unfortunately he tore not one, but TWO holes in my pillow!
As you can see, they're not very pretty. In both cases he managed to snap two strands of brown yarn, which raveled several stitches to either side. The repair was painful, but do-able.
My first attempt was not the best darning I've ever done. I managed to get things back into place, but I'm pretty sure I was off by a stitch or perhaps a half-stitch. It's a bit wobbly, but I dare anyone to find it without knowing exactly what they're looking for.
On the second, I took what I learned from my mistakes on the first hole and worked a bit more carefully. It may just have been an easier tear to mend, too. But I think I managed to sew it back up pretty seamlessly. I used two DPNs to hold things in place and duplicate-stitched back and forth until the hole was all gone.
Repairing is not my favorite way to spend my time. But it's good to know I can when I have to!