When your whole family is home for the holidays or Thanksgiving or something and you're sitting at the dinner table (dinner ended like twenty minutes ago but no one's cleared their plates yet) and an argument has broken out. Everyone's getting riled up and more entrenched in their particular point of view and the debate is escalating. And then, at a certain point, a family member (while making some "serious" assertion) incorporates a ridiculous/oddly-chosen phrase (e.g. "popcorn dust," "Rihanna hair") and everyone, including the speaker, has to really struggle to not smile as the argument continues.
For some reason, I'm often reminded of this sort of tableau when it's raining at night.