But Superman Can Fly

This was an interesting one. Quinn was sitting around chatting with me and the conversation took this really weird twist. I don't know whether it all stemmed from stuff he's learning at school, or a Mickey Mouse comic book that has Mickey in a rocket ship, but recently he's been really interested in gravity:

    Quinn: Gravity keeps things on 
           the ground.
       Me: That's right.
    Quinn: Is there gravity in space?
       Me: Some, but smaller objects 
           aren't really affected by 
           it as much in space, so 
           they seem to float.
    Quinn: *ponders for a couple of 
           seconds*
    Quinn: But Superman can fly.  How 
           can he fly with gravity.
       Me: *considers replying about 
           how current mythos have 
           Superman deriving his  
           powers from being under a 
           yellow sun, but realizes 
           that really doesn't explain 
           how he can actually fly, so 
           decides against that course 
           of action*
       Me: I don't know.  But remember, 
           Superman is just pretend. 
    Quinn: I think it's his cape.  His 
           cape has gravity in it.  
           That's how he can fly.