Oh, of course! (BTW, I am actually amazed that our Halloween was half-way decent, but only because he paced himself on time.)
For my husband, holidays have been invented for drinking. The problem is that once he goes over the limit, his behavior becomes unbearable. It really looks like someone pushes the button - there is a mood swing within seconds. At least now I know this is something he does not do on purpose and he absolutely has no control over it anymore. It is alcoholism and it is really ugly. This is when I stay away.