Merry Christmas, kid.

"Mommy has a new toy she would like you to play with."

 "Find out who's telling the truth—and who's not—by giving your suspect a lie detector test! Attach the sensor to your suspect's finger. Ask tough questions to really make 'em squirm! The indicator lights light up when your suspect isn't telling the truth. Busted!"

You better watch out
You better not cry
Better not pout
I'm telling you why
Santa Claus is coming to town
He's making a list
And checking it twice;
Gonna find out Who's naughty and nice
Santa Claus is coming to town... (sing-a-long)