I once came across a Santa who really knew his business.
It was at a community Carols by Candlelight and they had a Santa who was giving away little bags of lollies. My daughter Blossom (9 at the time) was getting a little skeptical about the whole Santa thing but hey, a bag of lollies is a bag of lollies so she joined the queue. I noticed that Santa would whisper something in each kid's ear and they would reel away looking thunderstruck, so I was determined to hear what he was saying.
Blossom's turn came, she got her lollies and Santa said "You've been a pretty good girl this year but there's just one thing I have to tell you..." and beckoned her close. Then he whispered "...when you clean up your room, you have to stop stuffing the rubbish under your bed!"
Blossom reeled away looking thunderstruck, clutching her bag of lollies and gasping "That was the REAL Santa, Mum! It HAS to be! He knew! HE KNEW!!!"
Ah, good times. She believed in Santa for another 2 years on the back of that experience