The "Yipee-Ky-Yay" bit from the Die Hard song by Guyz Nite (youtube search for it)
or the long stretch in one breath from Foo Fighters "Monkey Wrench" starting with "One last thing before I quit..."

Also the section from "The Ultimate Showdown Of Ultimate Destiny" from "Gandalf The Grey" to "Hulk Hogan".
( Edd: The Unfunny Try-Hard Edgelord, Tue 19 May 2009, 9:11, archived)

Aw man.
I've not heard the ultimate showdown for yonks. That Foos one is great too.
( Blue Star was working part time at the 5 and Dime, Tue 19 May 2009, 9:13, archived)

gandalf the grey and gandalf the white
monty python and the holy grail's black knight.
benito mussolini and the blue meanie, cowboy curtis and jambi the genie,
robocop, terminator, captain kirk, darth vader,
lo pan, superman, every single power ranger,
bill s preston, theodore logan,
spock, the rock, doc ock and hulk hogan?

/from memory so maybe wrong
( manolith hooray for me, Tue 19 May 2009, 9:19, archived)

Antimony, Arsenic, Aluminium, Selinium etc
/actually knows all the words
and the words to the Gilbert & Sullivan original.
( WormuIus, Tue 19 May 2009, 9:22, archived)