Conversations with a 4yo

I'm trying to work at home and Vian (4yo) is playing in the office next to me. He requests me to play with him. I took a break and told him that I'd draw with him. He insisted that I should play legos. So we made a compromise that we would draw then play legos. 

After what seemed like a good amount of drawing vehicles for a while, I told him that it is time for me to get back to work.

Vian: But you said you would play with me. 

Me: Oh yeah I forgot. 

Vian: Remember, you said we would draw and then play legos?

Me: Yes, I remember now. You should be a lawyer when you grow up Vian. 

Vian: Nah. I'm going to be batman when I grow up. 

As long as he has realistic goals, I'm cool with that.