23rd President: Benjamin Harrison, 1889
Nemo = 23 (Harrison was the 23rd president)
Hairy sons = Harrison
Five pee = 889 = 1889
Big Ben = Benjamin
Nemo (23) isn't best pleased with the five hairy sons (Harrison) as all five pee (889 = 1889) into his bowl.
Connect Harrison to Benjamin
The hairy sons (Harrison) took their pee just as Big Ben (Benjamin) was striking one.
NOTE: Mammoth Memory's way of remembering Benjamin or Ben is to think of Big Ben (the Ben that everyone knows!).