It made my jeans stop looking like this....
...and start looking like this!
They are my favourite jeans ever, but the waist was just way too big. The pictures aren't great (have you ever tried taking pictures of your own backside? No? Give it a go some time - hours of fun) but you get the idea. And now... no more hoiking them up all day, and, even better, no more builders bum! See how the two little brass studs are closer together in the second picture? That's what we're doing here.
So, I urge you to go forth and alter. Everyone has at least one pair of almost perfect jeans somewhere. See, I told you it would change your life.
I am, not for the first time, exceedingly grateful to have a father who never, ever, wears a boring shirt.