The Department of Health and Mental Hygiene is investigating after a photo surfaced on Twitter of a mouse inside a Union Square food stand.

Twitter user @PersistentCooki says he spotted the mouse crawling around at Mighty Pie around 9 p.m. Monday.

"This is the worst Disney sequel ever..." @PersistentCooki wrote in his Twitter post. (The mouse was, coincidentally, spotted beneath a sign advertising "Ratatouille.")

@PersistentCooki says he told the person working at the store, who walked over and did not see the mouse. The Twitter user says the worker then returned to his business and did not want to see the picture.

The DOHMH says it has sent an inspector to the site.

NY1 has reached out to Mighty Pie via email for comment but has not yet heard back.