Seeing Santa

We go to see Santa in Old town, and he arrived by Fire-truck (so double-cool in the eyes of my children) When it's our turn to see Santa Kelsi hops right up on his lap and
He says "Merry Christmas and what would you like for Christmas?"
Kelsi promptly replies "a walk ahind puppy"
To which he says "a walking puppy, good choice"

 Then Santa turns to Karli and asks "and what would you like for christmas?"
to which she replies grinning "poop"
Santa looks to me for clarification as Kelsi busts up laughing and Says "poop Karli?"
They both giggle uncontrollably and I turn red and giggle as well. (I think Santa turned red too)
then Karli says "or a walking puppy" and that was that.