Something nice

I do so much bitching about students that I feel I need to share something nice. I made a small mistake when I wrote my last test for lab. This mistake made one of the problems MUCH harder. Most of my students were on auto pilot and did what I did. They didn't even notice mistake and did the problem what way I intended it to be done. BUT I had a few who noticed the mistake and did the problem as written and GOT IT RIGHT I was so proud of them. (I gave them extra points) it was great to see them take what I taught them and then ramp it up two or three levels.
I'm having one of those Maybe-this-isn't-such-a-bad-way-to-make-a-living moments.