A video about various linguistics concepts from vsauceblog, including contrastive focus reduplication, retronyms, early emoticons, and rebracketing. As with many issues of unclear definitions, I’d say that the question about whether cereal is soup could be answered using Prototype Theory.
<3! I love the shout-out to Prototype Theory, too. I did my undergraduate honours thesis on ideas connected to this, namely how it might apply to the kind of errors little kids make. Potential future video topic for thelingspace in there!