Does Homo economicus describe real people well? (Voice acted story)

In “Did I ever tell you about the time I played game theory pranks on my cousins?” economics student Claudio dresses up as Sinterklaas and tries to around with his cousins, risking family disaster.

Homo economicus is an economic model of rational self-interested consumers. Is it always a good description of human economic behavior? Hear this!
Image: Sinterklaas (by Bram van der Vlugt) Written story: www.danielbernardus.com