Formal Languages
Formal Languages
[A large banner is hanging over a podium, where a speaker (Megan) is standing behind a lectern. Cueball crashes through the left side of the panel, scattering glass.] Banner. 10th Annual Symposium on Formal Languages Crash
[Cueball stops in front of Megan spreads out his hands and shouts:] Cueball: Grammar!
[Cueball then runs off the right side of the panel, so swiftly he leaves a cloud of dust in his wake. Megan at the podium just looks after him silently.]

This joke is a play on the phrase context-free grammar , which is a technical term used in formal language theory.
Cueball crashes Megan's speech on formal language theory, nonsensically shouts "Grammar!" without any context, and runs off. Because the gag is delivered in a particularly obtuse manner, the title text clears things up by having the confused audience mention "missing context", thus having them unwittingly explain the joke.
The concept of context-free grammar is incredibly nuanced and nigh impossible to rephrase in layman's terms. Luckily, the joke only interprets the phrase "context-free grammar" literally, so no understanding of the actual subject is required.
A context-free grammar can be described as a dictionary, translating single symbols to one or multiple symbols, who then are replaced again, until no further replacements are possible. If a string of symbols adheres to this grammar, it can be reconstructed solely by following these kind of orders.
[A large banner is hanging over a podium, where a speaker (Megan) is standing behind a lectern. Cueball crashes through the left side of the panel, scattering glass.] Banner. 10th Annual Symposium on Formal Languages Crash
[Cueball stops in front of Megan spreads out his hands and shouts:] Cueball: Grammar!
[Cueball then runs off the right side of the panel, so swiftly he leaves a cloud of dust in his wake. Megan at the podium just looks after him silently.]
