A steady stream of monsters and princesses are ringing my doorbell tonight. One little girl came up with her sister still in mom's arms. I put some candy in her bag and then some in her sisters', and she looked at her bag, then me, and said "Yum yum".
I agreed -- after all, it's candy and it's yummy. However, clearly I was just a someone dense adult and didn't really get it, because she held her bag up and a little bit closer to me, and said in a more insistent tone, "Yum yum!"
I'm slow but I can take a hint. I gave her more candy and she walked away happy.