Due to a dairy intolerance I buy almond milk to have at work, which is kept in the office fridge. Have realised over the past couple of weeks it has been going down very quickly. I caught a colleague using it and did say 'oh can't you use the office milk?' They looked a bit guilty but not sure if they've stopped using mine. And I think it must be more than one person.
Would it be really bad if I spiked the milk to teach them a lesson? Having my name on it hasn't helped.
It would be something safe to consume but taste bad...