LORELAI: So I guess the whole pudding thing was just a fluke, huh? Trying to get to know us, easing up on the rules, smudging that bottom line of yours. It was just some weird phase. What, you were on cold medicine last week or something?
In the US, many over the counter cold and flu medications contain dextromethorphan, a psychoactive substance which can produce euphoria or hallucinations when abused; they can also contain the opioid codeine which acts as a sedative. This isn’t the case in some other countries, where cold and flu medicines treat symptoms in a far less interesting manner.
The Annotated Gilmore Girls 