Did you know

I was told a story from my little sister that I don't recall ever hearing. She is committed to the truth of this story and in no way could I convince her otherwise.

Story:
Mary: Do you remember that time when D told us about him and his friend were sneaking around at their college and found the bomb shelter! Me: No??
Mary: remember they were in the bomb shelter and there were frozen blocks of milk stack up.
Me: what?!?!
Mary: yes, D came home and told us they found the bomb shelter with frozen blocks of milk!

So, D does this sound familiar??