You can often tell who has never worked in a restaurant by the little things they do without even realizing it.

This countdown looks at 20 habits that instantly stand out to servers, from sitting at dirty tables and ignoring the host stand to snapping for attention, making endless modifications, asking for things one at a time, and getting impatient during a rush.

We will also look at stacking plates badly, letting kids destroy the table, camping out after closing, rearranging furniture, requesting separate checks at the last second, and assuming the server controls everything happening in the restaurant.

None of these habits necessarily make someone a bad customer, but they can make an already stressful shift much harder.

Whether you have worked service or simply eat out often, this list may change how you behave at restaurants.

Watch until the end and tell us which restaurant habit annoys you most.