I created santa's sleigh
Its pretty hard to get 20000 pounds of presents to every child in the world in less then 40 hours
Regular rocket engines are too slow
Antimatter engines will kill you due to the G forces
Wormholes are too small for santa to fit in, just like chimneys
So I created a Faster Then Time drive.
Basically how it works is that I use negative energy to curve spacetime negativly around the sleigh. Due to the negative energy time speeds up inside the sleigh to an outside viewer. And an observer from the inside will see everything outside to be slow. Essentially, a small rocket engine on the inside could propel the sleigh around the whole Earth in just a few seconds - close to the speed of light.
SANTA IS REAL