Some examples:
Me: Isaak, do you want breakfast? (Big nods.)
Me: Isaak, would you like some milk? (Big nods.)
Me: Isaak, are you cute? (Big nods.)
Me: Isaak, can you please go put that (thing you're not supposed to be playing with) back where you found it? (Isaak just looks at me.)
Me: Isaak, are you ready to go back inside now? (Isaak runs in the other direction.)
You get the idea.
Today, sitting on the couch watching football and eating the last animal crackers:
Me: Isaak, does it taste better if you stick your animal cracker in between your toes before you eat it? (Isaak looks down at his feet and animal cracker, looks up at me and grins...and gives me a really BIG nod.) :)
Ewww.