A phishing attack.

(uncountable, film) A genre of film, science-fiction film-noir cinema. / (uncountable, fiction, by extension) A genre of fiction, thematically like that of the film genre.

(set theory, of a set) That is both countable and infinite; having the same cardinality as the set of natural numbers; formally, such that a bijection exists from ℕ to the set.

Full of quips.