UGH! My youngest has a milk intolerance, so we've got him on Soy milk and he's fine with it. When you buy it, it's just on the shelf, and we do refrigerate it to keep it cold. However, I guess we left it out yesterday so I put it back in the fridge. The wife said that it was left out all day, after it had been in the fridge for a couple of hours. I said it smelled good, so I took a sip ... tasted good. So I had a glass. Ended up thinking that it didn't taste quite right after all, so I poured the rest of it out. So, didn't get much sleep last night. The good part about this is that I'm sure my plumbing is all cleared out right now with all the flushing I've had to do. My colon is probably cleaned out as well. Other than that ... there is no good part to this story. Morale of the story. Put the "Soy Milk" back in the fridge after you open it and dispose of it after 5 days regardless.