Memes

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The joke:

The "630" on a calculator suggests the person may have mistaken their calculator for an alarm clock and thought it was 6:30 AM, possibly thinking they still had time to sleep.
Obviously, a calculator doesn't tell time, so it's a totally illogical and silly mistake.

The humor comes from how relatable or human this kind of goof-up feels — even though it’s ridiculous.
The boss's overly calm and understanding reaction adds to the humor because it's the opposite of what you’d expect in a work situation.