Dominos (and Pizza Hut) use dark patterns, UX tricks and design psychology to overcharge customers.

Forget 'Big Pharma', I'll demonstrate how (and why) 'Big Pizza' do the following:

From Wikipedia:

A dark pattern (also known as a "deceptive design pattern") is "a user interface that has been carefully crafted to trick users into doing things, such as buying overpriced insurance with their purchase or signing up for recurring bills".