So I was shown this website http://www.thecardtrickteacher.com/ which has a ton of interesting ways to use cards in the classroom.
There are some cool Math tricks to use in class as well as some fun other tricks to try.
What's neat is they have videos showing the tricks as well as how they are done.
Here is an example:
I always have a deck of cards in my classroom or in my TTOC bag, so I find these various videos pretty awesome.