The ultimate mathematical betrayal! Someone bought a textbook called "Calculus Without Derivatives" only to discover it actually contains chapters about derivatives on pages 118 and 134. That shocked cat face is the universal expression of finding out you've been mathematically bamboozled.
It's like ordering a "sugar-free" dessert and finding out it's 99% sugar. The author pulled the classic academic switcheroo - promising one thing in the title while sneaking in exactly what they claimed to exclude. Pure mathematical treachery!