What's going on
Tsukemen is a style of ramen where the noodles arrive on their own plate, separate from a small bowl of thick, intensely seasoned broth. You're meant to pick up a mouthful of noodles, dip it into that concentrated sauce, and then eat — the dipping is the entire point.
So when one diner ate his way through half a plate of tsukemen, decided it tasted of absolutely nothing, and raised his hand to flag down the waiter — only to realize, mid-gesture, that he'd been eating the noodles completely undipped this whole time — he found himself in a delicate spot. Too embarrassed to wave the waiter off with a "sorry, never mind," he improvised and ordered an extra portion of noodles instead. The waiter said nothing. The waiter's eyes, however, were locked onto the full, untouched cup of dipping sauce.
What follows is everyone gleefully reconstructing what must have been going through the waiter's head — because from the outside, a customer methodically eating plain noodles and then calmly requesting more looks a lot less like a tired mistake and a lot more like the behavior of a terrifyingly serious food critic.
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My take
Comments loosely translated for tone.