Tutorial: Learned something new!- Blind Hem

I got to spend some time Sunday with my mentor/sewing inspiration/all around coolest lady ever, my grandma. I had brought my bag of sewing projects (things I was fixing/altering for my "paying" customers lol) so I could get her advice on a certain pair of pants that were giving me some trouble. So she jumps on her (no lie) 50 year old singer sewing machine that still works like a dream, and proceeds to show me something called a blind hem. I'd seen the stitch on my machine before and had no clue what it did or what it was for (on the machine, it looks something like this: __/\__/\__). Once she showed me how to use it, it was a little bit of an "oh crap" moment for me. I'd seen her do stitches like that on my pants before, but never knew how she'd done it (I thought it was some sort of grandma magic).