In article , "Steve B" wrote:
My helper got a job. At the job, they have a communal fridge. There's one
guy who will come in and help himself to most anything there, but likes
milk. They want to get him. Other than letting the milk set out for a day
or two, what's the fast track to come up with some reeeealy skanky tasting
sour milk? I hope he gets this for youtube.

All of the following assume the guy drinks straight from the carton. None of
them are likely to work if he pours it into a glass first, because the
adulterations will be apparent.

Plan A: Dump anything strongly acidic (but edible) into it. Lemon juice or
vinegar will do nicely.

Plan B: buy a quart of milk, and a quart of buttermilk. Drink the milk, then
refill the milk carton with buttermilk. (Obviously won't work if the guy likes
buttermilk.)

Plan C: Plan B, but instead of buttermilk, use milk that you have allowed to
go sour in your fridge at home.

Plan D: Plan C using goat's milk. *Fresh* goat's milk is almost
indistinguishable from fresh cow's milk, but old, sour goat's milk has a
special flavor and aroma all its own, *much* worse than old, sour cow's milk.

Plan E: add anything edible that has a disgusting texture, such as grits,
cottage cheese, tapioca pudding, or tofu. Tofu has the added advantage of
disgusting taste as well. (Just imagine drinking milk from the carton, and
getting a mouthful of grits at the end. Yeccch.) Avocados and mangos (the
tropical fruit, not the pepper) are slimy; those might do, as well.