Why did the elves have a brainstorming session?

They wanted to toy with some new ideas.

What do you call a reindeer with bad manners?

Deer-spectless

Why did Santa always check his watch during gift delivery?

He didn't want to sleigh the schedule.

Why did Santa hire an accountant at the North Pole?

He needed someone to manage all the 'claus-es' in his annual budget.