accurate comparison

We were sitting at the table tonight, eating dinner, and the kids were pointing out each others milk moustaches. The next bit of conversation is as follows:

Jack: Dwarves have moustaches. And beards. Cara, you know, you're kinda like a dwarf. You're short, not very tall and you don't run very fast either.

At this point I had to go investigate "something" at the door and my husband had to avoid choking on his milk.

I think there may be too much fantasy/science fiction in our house when the 4 1/2 year old can actually make an accurate comparison of his 2 1/2 year old sister to a dwarf.