As the world's population swelled over the past few decades, Santa's sleigh got heavier and heavier, requiring more reindeer to pull it.
Santa hired two new reindeer as crew, Lee and Franklin. As part of their new hire training both Lee and Franklin go through a lot of physical training, navigational training, as well as a list of things that is to be packed on the sleigh.
Franklin is going through the list of banned items. There are weapons, drugs, etc., but one item caught his curiosity... Cement.
Franklin says to Lee "Hey, do you have any idea why cement might be banned?"
"No idea, let's ask the boss. I can't see why anyone would want that" says Lee
They both go to Santa's office and ask "Hey, Santa? Does anyone ever actually ask for cement for Christmas?"
Santa, in the process of checking his list, puts it down and says "Yes. Every year there is a small village by a river that floods constantly. They ask for as much as they can get to build a wall. Every year I refuse".
Both Franklin and Lee look at each other in amazement. That sounds like a great gift to give a village who needs it.
Franklin then asks "But Santa, why would you ban them from having cement? It sure sounds like they could use it!"
Santa turns to both of them and says...
"Frank, Lee, my deer. I don't give out dams"