We've all been there and felt the gut-wrenching pain.
You bring that delicious lunch you've carefully prepared at home to the work office.
You place it in the communal fridge, get on with your morning's work, and when you go to take it out later...
It's gone.
That's exactly what seems to have happened at Zak Toscani's office.
His posts about a co-worker discovering who had stolen his lunch have gone viral - with one tweet getting more than 460,000 likes.
ZaK Toscani
Zak works in a post-production office in Los Angeles
He told Newsbeat he never expected such a reaction.
"It's truly wild. I honestly thought some of my friends would get a kick out of this but it's been constantly exploding. It's been really weird.
"It's been awesome. I think so many people have responded to it because everyone who works in shared office spaces have maybe encountered something similar.
"It was not expected in the least but it's been really fun".
It all started on Thursday when he tweeted his co-worker was allowed by HR to check the CCTV to find out who had stolen his lunch.
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The lunch was shrimp fried rice.
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After watching the footage, the thief was revealed.
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Then came the company-wide email about not stealing other people's lunches.
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The culprit then apparently asked the victim: "Why would you go to HR about that?"
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Zak threw in a curveball by ordering three shrimp fried rice plates to the office.
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And then there was the cliffhanger.
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ZaK Toscani 