My friend Stuart knows almost every pressure point there is, and I guess the credit goes to him for this one.

Theres 2 methods of this, one to hurt, and the other for a reaction.

First of all, the one to hurt:
You get two fingers, and push with a fair amount of force into the sides of someones ribs, trying to force your fingers through the gaps in their ribs. You can try it, but like the majority of pressure points you wont feel a thing if you do it to yourself.

The second one:
Lets say someone has a hold of you, and you want them off. This will do the job. Again get 2 fingers and push into their side between the rib cage and their hip. Obviously you will need their arm to be raised for this maneovure, but if you do it correctly there arm will shoot back down by their side, and theres nothing they can do to stop it. Thus letting you go to go all karate kid on them. 

lol.. yes I enjoy this one for tickling the girlfriend 

I love that point!!!!  Try using ridge hands instead of 2 fingers.  Or, even better, palm heel.  Ouch!

the point is triple crossing, and it's not actually a point, it's where 3 meridians cross......
Spleen, Gallbladder and Liver.  The points don't actually cross, but the closest points on those meridians are Sp 16, Gb 24, ans L 14.  Works great to knock the wind out of someone.  They will double over and hold their side.  It hurts like crazy when you get hit there.  Plus, if you are lining up points for a knock out, you have alot of options!

Be careful with Grandma..........try a training partner first!

Duhhh!

How is grandma by the way?

sorry...........me either.