Why did Santa's elves go to the North Pole's HR department?

Because they wanted to file a grievance about all the Claus-trophobic workspaces!

Why did Santa get an assistant?

He was tired of claus-trophobia in his office.

What do you call a group of cows singing Christmas carols?

A moo-sical choir

Why did Santa need an extra large desk at the North Pole?

He had a lot of Claus-es in his contract.