What happens
Falstaff brags to Pistol and Nym about his plan to seduce both Mistress Ford and Mistress Page for their money, boasting that he's already sent them identical love letters. Mistress Quickly arrives as a messenger from both women, confirming they've received his letters and are eager to meet him. Ford arrives disguised as Master Brook, a wealthy gentleman, and pays Falstaff to seduce Mistress Ford so he can test her virtue. Falstaff agrees, believing he's about to profit from both wives and Ford's money.
Why it matters
This scene establishes the central con that drives the entire plot. Falstaff's confidence that he can seduce two women simultaneously with the same letter reveals his fundamental arrogance and disconnection from reality. His boasts about making the wives his 'East and West Indies'—treating seduction as a commercial enterprise—expose him as a man who sees women purely as financial resources. Pistol and Nym's refusal to help and their later plan to inform the husbands show that even his own followers despise his presumption. The scene pivots on Falstaff's complete blindness to the actual power dynamics at work: he thinks he's manipulating everyone, when in fact multiple parties are already moving against him.
Mistress Quickly's arrival as a messenger creates a false sense of validation for Falstaff, but the language she uses—carefully flattering while delivering messages from both wives—plants the seeds of his downfall. Her report that both women are desperate for him should be Falstaff's first clue that something is wrong; identical interest from two sources suggests coordination, not genuine desire. Ford's appearance as Master Brook is the turning point. By disguising himself and paying Falstaff to seduce his own wife, Ford transforms from a potential cuckold into an active deceiver, mirroring Falstaff's own tactics. This establishes the play's central irony: Falstaff thinks he's running schemes, but he's actually walking into traps set by smarter, coordinated opponents.