If the two bodies are in contact, / the force on each body due to the other body must be equal & opposite.
A One Does Not Simply meme.
One Does Not Simply comes from The Lord of the Rings: The Fellowship of the Ring (2001), where Sean Bean's Boromir warns the Council of Elrond that "one does not simply walk into Mordor," forming a circle with his thumb and finger. The meme keeps the opening words and swaps the ending for any task that is far harder than it sounds - eating just one chip, closing a single browser tab, leaving IKEA with only what you came for.