2yo: I can't reach my excavator (small toy excavator that he plays with in the car)
A: sorry buddy I can't get it while I'm driving.
A: it's too dangerous when I'm driving
A: because when you drive you have to be very careful and watch for other cars.
2yo: oh. Because there is traffic.
A: yep. I need to watch out for other cars and pay attention.
2yo: oh. Because all the traffic cars are trying to go home. (We've had many conversations about traffic)
A: yep, we are all trying to get somewhere safe.
2yo: we all need to be safe.
<<<30 seconds elapse>>>
2yo: but I need my excavator.
A: Well, thanks for weighing all of our safety and well being against your own needs.
*i didn't say the last one but the thought did make me chuckle. Not to mention we have had this particular conversation about 10,000 times.