I think for the majority today, the most entertaining thing is seeing something novel, something spectacularly new or impressive that gives us a new perspective on life.
Though it has to be said that other things are up there in the entertaining hierarchy, this is how I would rank them:
1. Seeing something awe-inspiring
2. Watching others humiliate themselves
3. Challenging yourself
4. Being with a group of loved ones/friends
5. Going on HubPages and reading quality articles.