What happens if you drink spoiled milk?

I was making potatoes and decided to add some milk to it. However I didn't know the milk was spoiled until I had already ate the potatoes and decided to see if it was expired or not. I didn't use very much , barely even 1/5 a cup if even that, but I'm still wondering if it can still be very... show more I was making potatoes and decided to add some milk to it. However I didn't know the milk was spoiled until I had already ate the potatoes and decided to see if it was expired or not.

I didn't use very much , barely even 1/5 a cup if even that, but I'm still wondering if it can still be very dangerous.

The milk wasn't chunky or anything but it was definently expired by it's smell, which wasn't that bad but strong enough to tell it expired.

So...
What do you think?
Update: Also, there were about 19-24 potatoes. So about 1/5 a cup mixed into like 22 potatoes.
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