Misc: what protruded from the rocks at the end of the film 'planet of the apes'?

Questions

"-------------- has taught us to eat with a fork, but even now if nobody is around, we use our fingers."- Will Rogers?

"Civilization is unbearable, but it is less unbearable at the top."- Timothy Leary?

"------------- music is the kind we keep thinking will turn into a tune."- Kin Hubbard (1869 - 1930)?

"------------ make the man. Naked people have little or no influence on society."- Mark Twain (1835 - 1910)?

"Cockroaches and -------------- are the only things that can stay up all night and eat anything."- Herb Caen?