Alcohol, ecstasy and cocaine might be of help: only in terms of a mind-state reference point.

People that have had cocaine try and remember what it's like to be in that cocky and confident state and relive it. Also the memories of being drunk: if you can trick your mind into behaving tipsy or loose. Or the openness of ecstasy.

If only you could put yourself in these states without actually needing those substances. (btw, I am not suggesting you dabble in drugs at all)