Sorry, it cut off a bit of what I was saying. I was getting kicked out of the forum and told I could not post, that I did not have permission, so I posted what I could.
Anyway, with my mom, she was shocked when "chocolate pudding" got my kids to all cooperate in a hurry even though I didn't give them any. Later I explained what I had done. I used that plan for well over a decade with my family. My husband doesn't even really like sweets and it even worked on him after a short while!
The trick is to find what motivates your son. It might be toy cars or dinosaurs or chocolate or caramel or dirt or books or something else. Once you figure out what his favorite things are, you start using them. I felt food was the easiest thing to use for us. Luckily all of my kids were incredibly fond of it. Plus they were a bit jealous because I had the idea that some things were just for grownups, like hte ability to have chocolate whenever you want. Hey, there have to be SOME perks for dealing with the hassles of being a grownup. So my kids knew that adults got some words that were just for them, some drinks, and unlimited access to chocolate and many other junk food that kids only got once in a while. I thought I could use that jealousy in my bid for their attention.