Chick-fil-A fans are firmly rooted in their heads – and stomachs – that the chicken chain is closed on Sundays.
But the Atlanta-based fast food chain apparently forgot when it sent an email to some of the loyalty members this week.
"Calls all sandwich lovers," the email that also promoted the Chick-fil-A One program said: "Some prefer it grilled, others like the original. Whichever Chick-fil-A sandwich you love , order your November 3 for National Sandwich Day. "
This year, the prepared food holiday, which is held annually on November 3, falls on a Sunday, which is also the day of rival Popeyes & # 39; chicken sandwich – the one requested this summer's Chicken Sandwich War – returning to restaurants.
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Another email followed Thursday with the subject, "Well … this is difficult. "
" We recently sent an email that included a message about National Sandwich Day, which we were naturally very excited about, "the email reads. "We did not know that it will fall on Sunday when we are closed. We apologize for the confusion and hope to see you soon (Monday-Saturday)."
In a statement sent to the United States TODAY, Chick-fil-A popped fun with his own mistake.
"Cows are sometimes too keen on their quest for self-preservation," Chick-fil-A said in the statement. "They have been reminded that Sundays are off-limits."  Popeyes took a tomb at Chick-fil-A earlier this week by announcing that the chicken sandwich would return the day the competition ended.
In a short YouTube video, a freeway sign showing Popeyes and Chick-file-A's names is updated to add the words "open Sunday" under Popeyes, next to "closed Sunday" under Chick- file-A.
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Chick-fil-As's plan has a fan in Kanye West.
In his new "Jesus is King" album, there is a song called "Closed on Sunday" where he mentions Chick-fil-A with the lyrics, "Closed on Sunday, you my Chick-fil-A. You're my number one, with the lemonade. "
Follow USA TODAY reporter Kelly Tyko on Twitter: @KellyTyko