A couple students demonstrate a traditional Inuit game known as the finger pull. Basically two opponents brace themselves against each other on the floor. They lock fingers and pull back toward themselves. The winner is the one who a) pulls hard enough to cause the opponent's finger to straighten or b) makes the opponent let go.
This is one of my favourite sports, along with the Alaskan high kick. It takes some good technique in addition to upper body strength of course. A nice ice pack afterwards is also a good idea.