The photo, depicting a recycling container in Edinburgh near a Papa John's location, was posted to Twitter Tuesday by Ailsa Burn-Murdoch, who tweeted, "I have a feeling @PapaJohnsUK owe a local sanitation worker free pizza for a year," the Scotsman reported Tuesday.
The Kentucky-based pizza chain said it is investigating the incident with the help of the Edinburgh store.
"Came out of a meeting to find I've created a monster. Also I now want pizza. Odd day," Burn-Murdoch tweeted later in the day.