Here is the research, as summarized by the first author. Here is the original study.
This example admittedly panders to undergraduates. But I also think it is an example that will stick in their heads. It provides good examples of:
1) Self-report vs. other-report personality data in research.
-Two weeks prior to the drinking portion, participants completed a Big Five personality scale as if they were drunk. So, there is the self-report of Drunk!Participant. And during the drinking session, participants had their Big Five judged by research assistants coding their interactions with friends, allowing a more object judgment of the Drunk!Participant.
-Why do we need self and other reports? What sort of traits are people most likely to lie about? This could also open up a conversation about Lie scales, especially their use in situations when their is pressure to present well, like during job interviews.
-What other sort of other-reports have your students seen used in research? I've seen research that asks teachers to evaluate students, parents to evaluate children, etc. When might an acquaintance be a better source of data than a stranger?
2) Conceptual examples of repeated measure/within subject t-test and paired-participant/between subjects t-test.
-At Time 1, Ps reported their personality under normal circumstances, and what they think think of their personalities when drunk. Within-subject t-test. Results: Ps believe that their personalities change substantially when drunk.
-At Time 2, while the participants were drunk, they were observed by research assistants. The research assistants made their best guesses at the Ps Big Five. Between-subject, matched t-test. Results: P extroversion seems to increase, but raters didn't find any other increases.
3) Example of using the Big Five in research.