Fish won't eat, wondering about poking near gills

So, my fish won't eat the betta bits. Big surprise. I've had this problem with many other fish. So, here's my thing. I've been wondering for a good part of the day what would happen if I took the fish out and poked him with a needle behind his gills, where it is a bright red color, once on each side. Would he start bleeding? Would he swim differently?

I know this is a cruel thing to do to a fish. It probably would cause him some pain. I was just wondering about it and I guess that's because: 1) I am bored and 2) the fish won't do what I want him to do, i.e. eat his pellets like he's supposed to.

I'm trying not to do it. I know it probably wouldn't be good for the fish. He probably wouldn't be the same after I do this. I am going to buy him some frozen food and see if he eats it.

I will give him some time to behave himself. Then if he doesn't.. well.. there could be some repercussions for him.