Question: Why would liquid half-and-half creamer curdle when poured into hot coffee? This happens to me sometimes, and I'm not sure why. Could it have something to do with either the coffee being too hot or the creamer being too cold?

Answer: 
I have organic heavy cream expiration date is March 15th 2018. Its Feb 17th. When I pour it in my hot coffee it's still looks like it's curdled until I stir it in. Even if I pour it over the back of a spoon. Still tastes great and it hasn't upset my stomach. But it is odd that it looks like it's curdling, it must be an effect from the coldness of the cream to heat of the coffee, or fat content reacting to heat, acidity. My best guess. Just weird, that it happens.
The acid in coffee causes the cream to curdle.