Subliminal, in an unnoticeable way
->Important, and hard to see.
—'They Might Be Giants, "Subliminal"
" Could nefarious supercriminals have altered your favorite comic or puzzle, for evil purposes? Itís best to handle the Sudoku with tongs, just to be sure!"
If you play an Oasis album backwards you hear messages from Satan.
Even worse, if you play it forwards you hear Oasis.
nevaeH ni tra hcihw rehtaF ruO, ruO rethaF hcihw tra ni nevaeH
—Bone Thugs-n-Harmony Intro...
Yvan eht nioj!