Begging for Candy?

My mother relayed a conversation she had with my eight year- old niece regarding trick-or-treating and I found it amusing.

Mom: Beggar's Night is tomorrow at the mall.
Niece: What does that mean?
Mom: Well, that is what they used to call trick-or-treating.
Niece: (puzzled) Why?
Mom: Well, I guess because the kids go door to door "begging" for candy.
Niece: (horrified) Well, I don't beg for anything and I'm not doing that!!!!

But, of course, she did.