Starbucks has apologised for serving a Catholic teacher two drinks drizzled with '666' and a Satanic symbol.
Louisiana schoolteacher Megan K. Pinion used social media to vent her anger, posting a photograph of the "Satanic" drinks accompanied by a long post explaining the situation on Starbuck's Facebook page.
"This is how my coffee was served to me. I unfortunately can’t give the young man’s name who served it because I was so appalled that I could not bring myself to look at him,” she wrote.
"The star is almost okay because it is in your Starbucks logo, the 666, however was quite offensive. I am in no way judging his beliefs or dis-meriting his beautiful artwork, I am however judging his lack of professionalism and respect for others."
She added: "I am a teacher in the public school system and if I were to present a child of atheist of pagan believers with a Christian art project I could be sued in a heartbeat.
"I am of Catholic faith and would love to share my beliefs daily. Fortunately I have enough common sense to present myself with professionalism and follow and ethics code. Perhaps that could be suggested to that particular location."
The number '666' is often associated with the Antichrist and is used to invoke the devil in Satanic rituals. The inverted five-point star- sometimes known as the 'Seal of Satan' - is also used by devil-worshipers.
The fear of the '666' is known as Hexakosioihexekontahexaphobia and causes people to become nervous and agitated. Famously, President Ronald Reagan changed the address of his Bel Air mansion on 666 St. Cloud Road to 668 St Cloud to avoid 'the mark of the Beast'.
A spokesperson for Starbucks said the coffee giant apologised to Ms Pinion after seeing her post on Facebook and is investigating the issue.
The Starbucks barista who served the 'Satanic' drinks has not been identified.