The sushi chef was let go

This joke serves up a delightful double helping of wordplay, the true secret ingredient to its humor. The punchline hinges on two common English idioms, both given a clever twist. When we hear someone is "on a roll," it usually means they're experiencing a string of successes, performing exceptionally well. But for a sushi chef, being "on a roll" takes on a wonderfully literal meaning, as they're constantly crafting delicious maki and uramaki, meticulously assembling rice, fish, and nori.

The second piece of the puzzle is "got canned." This phrase is a playful, informal way of saying someone was fired or let go from their job – a rather unfortunate turn for our talented sushi maker, despite their culinary prowess. The humor comes from the sudden shift in meaning, juxtaposing the chef's literal skill with the metaphorical idiom for job termination. It's a quick, clever linguistic sushi roll that leaves you with a smile, proving that even bad news can be funny with the right words.