This one paragraph from The Innocents Abroad is one of the funniest moments in the history of literature and is full of more innuendo than can be counted:
"The party started at 10 A.M. Dan was on his ass the last time I saw him. At this time Mr. Foster was following, & Mr. Haldeman came next after Foster—Mr. Foster being close to Dan’s ass, & his own ass being very near to Mr. Haldeman’s ass. After this Capt. Bursley joined the party with his ass, & all went well till on turning a corner of the road a most frightful & unexpected noise issued from Capt Bursley’s ass, which for a moment threw the party into confusion, & at the same time a portughee boy stuck a nail into Mr. Foster’s ass & he ran—ran against Dan, who fell—fell on his ass, & then, like so many bricks they all came down—each & every one of them—& each & every one of them fell on his ass."