Included in the now-viral message from the US State Department: a picture of a cat in a Cookie Monster-style outfit, grasping a plate of cookies, and an invitation to attend an upcoming "cat pyjama-jam".
The email was titled "meeting" and featured a title "cat pajama-jam" underneath the photo of the tabby cat.
One day you think you're invited to a wonderful party filled with cookies and cats in sleepwear, but the next day, you're out.
"Sorry to disappoint those of you who were hoping to attend this "cat pyjama-jam" party, but such an event falls well outside our area of expertise", U.S. mission to Australia spokesman Gavin Sundwall told the Australian Associated Press.
The email, which has been cited as a "training error", was sent from the United States' embassy in Canberra, Australia as a fake meeting invitation.
"Sorry to disappoint those of you who were hoping to attend this "cat pajama-jam" party, but such an event falls well outside our area of expertise", he wrote two days after the original email went out.
The US Embassy has no further plans to host any parties for cats in or out of pyjamas. He insisted that "strong new management controls" would prevent a repeat of the freaky email, The Guardian reported.
UPDATE: Oct. 15, 2018, 3:49 p.m. AEDT This article originally held the headline suggesting the U.S. Embassy had sent the email, when it was actually sent by the Department of State.