The Battle Creek Enquirer reported the woman and a 25-year-old man went into the station Wednesday to pay for gas and two cups of cappuccino. Police said the couple argued with the clerk about the price, which was posted on the coffee machine.
Police said the man put down one cup and started to walk out, but the woman picked up the cup and threw it at the clerk.
Police later found the man and arrested him on an earlier warrant. The woman was being sought and charges could be filed.