A cab driver returned a staggeringly high amount of cash he found inside of a backpack that a passenger left inside his vehicle Friday afternoon, Boston Police said. 

After picking a man up near Mass Ave and Tremont Street and dropping him off at his destination, the driver noticed his passenger left behind a bag containing what would be one hell of a tip: a (very) cool $187,000 in cash. 

The driver brought the bag to Boston Police Headquarters, where it was inventoried by the department's Hackney Unit. Perhaps unsurprisingly, the department quickly received a call from a man claiming to be a passenger who forgot a bag of cash in a taxi ride. 

After the man provided authorities with some proof of ownership, the man was reunited with his bag and money, officers said. 

"This hackney driver exhibited exemplary behavior and his honest deed should be recognized,” Police Commissioner William Evans said in a statement. “His actions represent the high standards that our department has for our drivers."