Whose igloo is colder?

This is better when said than read, great clean(ish) family joke.
Kids love it.
Two eskimos are discussing how cold it is in their igloos, one says look at this, and takes the boiling kettle of the fire and pours some out, the hot water turns to ice before it hits the floor.
The other says "that's nothing, come over to my place". So they troop over next door to the neighbours igloo.
"check that out" he says pointing to a brown stain in the frozen ice bed.
"what is it?" his friend asks.
He gets a knife and carefully chisels around the stain untill he has a small block of brown ice in his hand.
He tosses it into the fire.
THHHHHHT (fart sound)