Disclaimer: I have almost no sense of smell, and thus a slightly diminished sense of taste.
I was over at my brother's house after a day of shooting, and I grabbed an almost full bottle of Nesquick from the fridge and chugged it. I thought, "Geeze, he needs to turn his fridge down, this stuff is 1/2 frozen." Then it hit me, if it was frozen, it would have been crunchy with ice crystals. It was actually chunky/slimy going down. Then I noticed a bit of a tang to it. Finally putting the pieces together, I checked the date... Four months 13 days after the "Best if used by" date. Ant it wasn'tlike it might still be ok because it wasn't opened, it had been.
I couldn't get the though of what I had drank out of my head all day. Fortunaltely, I could hardly taste how gross it really was. HE cringed at the smell when I brought it to him.