All that comes to mind is.......The Best Little ********** in Texas.......lol....shhh, I digress..
Irish dancing - Just so I could wipe the smile of that smug bastard Michael Flatleys face
A Troll :D
Being a pain to others!
....best on earth... at being the best on earth at things.
Or is that too much like the "I wish for endless wishes" genie answer?