PLEASANTON — It’s not every day you see an upside down American flag outside of a federal building.

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The trap has been set for Connecticut’s renegade beefalo But on Thursday, the American flag outside the U.S. Post Office in Pleasanton on Black Avenue hung upside down for what might have been several hours until it was righted around noon.

The mistake, which the post office said was likely made by a custodian Thursday morning when the flag went up, gathered the attention of passerbys — enough for some to call the police.

When the post office realized it was upside down, it was corrected.

Rules and regulations of the flag (U.S. Flag Code) state that the union should never be upside down, unless as a sign of distress or extreme danger. Flags flown upside down are usually a symbolic sign of protest.