My third and last recommendation
I'd like to propose
A Connecticut Yankee in King Arthur's Court by Mark Twain
and we can find it at
Gutenberg
Wikipedia says "The novel explains the tale of Hank Morgan, a 19th-century resident of Hartford, Connecticut who awakens to find himself inexplicably transported back in time to early medieval Britain at the time of the legendary King Arthur".
P:S.
There are more books that I would like to share a discussion, but I cannot find them as ebooks on the Net. They are
Comma 22 by Joseph Heller that I consider hilarious and my wife not.
The Good Soldier Švejk by Jaroslav Hašek. I saw it - for mere $ 29.00 - chez
samizdat (*)
Only When I Larf by Len Deighton
My Uncle Oswald by Roald Dahl
Home is the sailor, in portuguese Os velhos marinheiros ou o capităo de longo curso by Jorge Amado.
Karl Valentin's TingelTangel (*)
The Revolt of Gunner Asch by Hans Hellmut Kirst, first of the 5 books series "Band: 08/15 ..." (*)
Dienstbüchlein by Max Frish. I could not even find the English translation, but this is really hilarious.
Changing Places by David Lodge, first of a series
Confessions of Felix Krull by Thomas Mann (1954)
(*) to have these books on my reader I'd be ready to chance my soul on the DarkNet. Nah, that's not true.