You would TOO on a freakin' boat for forty days and forty nights with the closest thing to solid ground being a huge freakin' boat, and smelly stables home to pairs of every animal in the world.
A whole smorgasbord of nasty smells, no sight of a bright sunny day, terrible bathroom conditions and no HOPE of escaping it even for fresh air? Not to mention, it took him until he was a hundred something for him to finish it, and all of the people outside of his immediate family got wiped the heck away, never to be seen again...
That's a heck of a lot to take in.
Srsly, give the guy a break.
“…Judge not what a man has done, but judge what he could have done if he was a different bloke altogether. For art thou a leper? And a leper can changeth his spots…” --Rudy Wade, Misfits (Series 4, Episode 8)