Sometimes Lupin does not know where he is, and it is thought that he drinks much ripple when alone.
Lupin: Odd, I feel slightly ill today. Might be a full moon a'coming.
Harry: Professor Lupin! The full moon is coming out early tonight! DON'T LOOK UP!
Lupin: Raaaaaaawwwwwwwwwwwwww!
Harry: Cannot speak because he is being devoured.