In Season 5 Episode 8 of Family Guy (Barely Legal), there is a scene where Meg turns the lamp in her room on and off while spinning the tag on Brian's collar while somebody sings an aria.
The context of this clip (which is pretty much the plot of the episode) is that Brian took Meg to the prom as a favour, they made out, and Meg became infatuated with Brian ever since. This is one of the things she's done as a result.
To this day, I have no idea what that scene means. It appears to be a ritual of some sort, but I don't know if it's just something made up by the writers or whether it actually refers to something else.