Much of the work Robert Irvine does on Restaurant: Impossible focuses on showing business owners and their employees where they've made mistakes in the past and how they can best fix them going forward. To teach those lessons, however, so that the staff will learn once and for all how to avoid similar struggles in the future, Robert is forced to be brutally honest in his assessment of the restaurant's design, its food and the management skills of its leaders. It's ultimately for the betterment of the business that Robert shares his tough love in the form of constructive criticism and unhindered remarks about what he's seeing and tasting at the restaurant.

In the more than six seasons Restaurant: Impossible has aired, Robert's gone to great lengths in words and actions to prove his point to businesses owners and their staff, holding no bars in his assessment of the good, bad and just plain awful scenes he finds in kitchens and dining rooms. Click the play button on the video above to watch the top-five tough love moments, then tune in to an all-new episode Wednesday at 10pm/9c to watch Robert tackle his latest restaurant mission.

Check out more of Restaurant: Impossible's top-five video mash-ups and see the dirtiest restaurants, the best sledgehammer moments and the most-unforgettable meltdowns.