Thirds

A grade 9 girl, learning a new piece.  In 4th position, her fingers were not quite sure of their spacing.

Me: What's that interval? [C-E]
Girl: 3.
Me: Ahem.
Girl: A third.
Me: Better.  What sort of a third?
Girl: Minor.
Me: Um, why?
Girl: Because it sounds really creepy.
Me: Ooh.  [I played it an octave lower]  How about then?
Girl, very confused: Major.  Definitely.  Not creepy at all.

[In case you're not sure - C to E is a major third]