Recursion, defined. (Oh, how I adore Wikipedia!)
http://en.wikipedia.org/wiki/List_of_lists_of_lists
List of ancient king lists
Lists of A&M Records artists
Lists of ABC shows
Lists of African Americans
Lists of African Union members
Lists of American films
Lists of American football players
Lists of American television episodes with LGBT themes
Lists of American writers
Lists of Americans
Lists of Argentine films
Lists of Australian rules football leagues
Lists of Australians
Lists of Austrian films
Lists of Azerbaijani films…
&c.