Best Conversation of 2012 while awaiting surgery

I had this conversation with my mom when we were waiting for my foot surgery to start.  She did a very good job of distracting me from the task at hand.

Mom: We saw Life of Pi and it was just amazing.  That tiger was incredible.
Me: It was a CGI tiger, right?
Mom: What is CGI?
Me: Computer generated.
...[pause]
Mom: No, it was a real tiger.
...[pause]
Me:  You know how like, sometimes actors are people and sometimes they are animals?
Mom: Yes.
Me: Are you saying that the actor who played the tiger was a real tiger?
...[pause]
Mom: Yes.
Me: I don't think it was a real tiger.
Mom: It was real. You should have seen his face, when he was holding on to the side of the boat.
[she mimes a tiger holding on to the side of a boat]
Me:  A real tiger... IN A BOAT!  No.
Mom: And at the end, he was so skinny.  It was very sad.
[she mimes tired tiger]
Me: They starved the tiger!
Mom: No, they just got a sick tiger to play that part.
[enter nurse]
Mom: have you seen that movie, Life of Pi?  It's amazing, it has a beautiful tiger in it.
Me: It can't be real.
Nurse:  Oh. Animatronics.