When the product manager proudly announces support for 86-inch displays while the frontend devs are sweating bullets trying to figure out how to make that responsive layout not explode.
Nothing quite captures the silent horror of realizing your carefully crafted CSS is about to be stretched across a display the size of a small country. The PM's excitement is directly proportional to the developer's existential dread.
Meanwhile, somewhere in the codebase: max-width: 1200px; /* nobody will ever need more than this */