Well here we go.
FIRST OFF, I'm not naming the place where this went down. I'll just say it is a popular fast food place known for having meats.
And... the manager of this one restaurant, in Vancouver, Washington, admitted to the cops he relieved himself twice in the milkshake mix at the restaurant and now, cops want to get in touch with the customers.
Turns out the cops had been keeping an eye on this Stephen Sharp, the manager, for some other deviant stuff he'd been doing. When cops searched his devices, they found a video of Sharp doing his business into the milkshake mix. Sharp confessed to having done said business twice in the mix prior.
Turns out there was something sorta 'extra' in that shake after all...