The road trip montage on the America Tour bus, which includes such gems as Beavis and Butthead being more interested in a donkey taking a crap than the Grand Canyon, them laughing at various dirty road signs, such as "Butte" and "Wipe" and "Bald Knob", and headbanging to the montage music.
When they arrive at Yellowstone National Park, the duo are absolutely MESMERIZED by the motion controlled flushing for the park urinals, to the point where they stay in there so long that the bus leaves without them.
When the two end up on a bus full of nuns on their way to New Mexico, Beavis is taken in by having the bible read to him, since "there's this talking snake, and a naked chick, and a dude who puts a leaf on his schlong".
The "He said anus" exchange between the boys and Mr. Van Dressen.
The deleted scene of Beavis using the Declaration Of Independence as toilet paper. Its even more hilarious that there was a security guard standing right there, who didnt notice Beavis smashing the display case with a flagpole and stealing the document until the alarm sounded.
The montage of the two arriving at the luxurious hotel and casino theyre staying at, and spending most of it staring and giggling at a topless egyptian statue, to the tunes of Red Hot Chili Peppers Rollercoaster Of Love.
Bill Clinton giving a touching, grateful speech to the two after they foiled Muddy's and Dallas plot. Their reaction?