I have been seeing these everywhere on the internet.  Could this be a new Human sport?

This Human woman is the first we witnessed participating in this new sport:

http://www.geocities.com/mr_marble_madness/ragdoll/tetka.htm

and her sister/cousin/neice/aunt/mother/best friend/absolute stranger she met at the beach just had to try it:

http://www.geocities.com/mr_marble_madness/ragdoll/ragdoll.htm

So a doctor decided to check it out for himself:

http://www.geocities.com/mr_marble_madness/ragdoll/who.htm

With the doctor's approval, a Human celebrity had to join in the fun:

http://www.geocities.com/mr_marble_madness/ragdoll/vertigo.htm

Followed by Human government leaders from the UK:

http://www.geocities.com/mr_marble_madness/ragdoll/tony.htm

and then from the USA:

http://www.geocities.com/mr_marble_madness/ragdoll/bush.htm

So what is this new sport called and how do squirrels learn to play it?