When you think about it, a hangover is a profound spiritual and philosophical experience.
You start with the Metaphysical questions -
Who am I?
Where am I?
Why am I here?
Who are you?
Then you move on to the Epistemological ones -
Do you know who I am?
How do you know who I am?
Next comes the Theological questions -
How in hell did I wind up here?
What in God's name did I do last night?
Oh God! I didn't do that did I?
After Theology, most people resort to logic -
Now, I'm reasonable person - I wouldn't have challenged the bouncer to a fist fight...
No, hang on, I get drunk on the sniff of the barmaid's apron - I can't have drunk all of those drinks...
However, the final stage is the move to Moral Theory -
I wish I hadn't done that...
What I did was wrong...
And there you have it - a profound philosophical discussion, after a night on the tiles.