Slightly morbid academic one.
My computer science professor (who is from Eastern Europe) was explaining an algorithm that he and another professor (from South America) developed. The algorithm processes a graph by first creating a “frame” around it. Since English was not the first language for either of them, the first word they thought of was karkas (каркас, frame in Russian). English word “carcass” sounds pretty much the same, right? but only later, after the work was submitted, they realized they were creating a dead body around the graph.
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