The summary is:
The speaker is a former employee of a fast food restaurant who reveals some of the tricks and scams that the cashiers use to increase the sales and deceive the customers. He advises the viewers to be aware of the hidden costs, the quality of the products, and the charity requests that they may encounter when ordering food. He criticizes the fast food companies for exploiting their customers and employees for profit.
Here are the key facts extracted from the text:
1. The text is about how fast food restaurants use various tricks to deceive customers and increase their profits.
2. The text is based on the author's personal experience of working as a cashier in a fast food restaurant.
3. The text gives examples of how cashiers offer additional additives, sauces, syrups, or larger volumes of drinks and food without informing the customers about the extra cost or the reduced quality.
4. The text advises customers to be vigilant, check the receipt, ask for fresh and hot products, and refuse to donate to charity when asked by the cashier.
5. The text criticizes the fast food companies for being greedy and dishonest and exploiting their customers and employees.