I just had one of those Eureka! moments when the idea simply pops-out of your head.
Santa is real!
and the parents (people who love you) are real as well
My poof is based on two scientific papers
Apollo Missions
During the Apollo flights, astronauts reported, I quote: "blue with a white cast, like a blue diamond."
Colors came in various shapes, stars, stripes, dots, clouds…
This strange visual experience was caused by the exposure to cosmic rays [1].
In other words, it’s possible to see something if you are affected by some kind of fast neutrons.
If the Santa is in the domain of quantum mechanics, it can be seen.
How can it be observed by all the people?
It’s simple!
He has a speedometer, thus his position can’t be determined, according to Heisenberg's principle of uncertainty.
Consequently, it can be everywhere, run at the speed of light and affect all the people in a moment of time [2].
References
Budinger, Thomas F., Hans Bichsel, and Cornelius A. Tobias. "Visual phenomena noted by human subjects on exposure to neutrons of energies less than 25 million electron volts." Science 172.3985 (1971): 868-870. Link
Busch, Paul, Teiko Heinonen, and Pekka Lahti. "Heisenberg's uncertainty principle." Physics Reports 452.6 (2007): 155-176. Link