Philosophy with a three year old

I will postulate that it's impossible to 'win' a philisophical discussion with a three year old. They're too smart. I can't prove this, but here's a data point:

Annette: Can I play Elebits?
Me: No, we're about to have supper.
Annette: But I want to play!
Me (Attempts to distract): Well, maybe *you're* an Elebit.
Annette: I'm not!
Me: How do you know?
Annette: Just because Elebits aren't real!
Me: Oh. Are you real?
Annette: Yes!
Me: How do you know?
Annette: Because I'm wearing pants!