É engraçado mesmo is a common Brazilian Portuguese expression, literally meaning it is funny indeed, and it circulates online as a short reaction clip rather than as a line tied to one famous scene. Its appeal comes from its flexibility: said flatly, it can sound sincere, and said with a knowing edge, it becomes gentle mockery. That ambiguity has made it a handy insert for Portuguese-speaking creators on short-form video and soundboard platforms, where a familiar phrase can carry the joke without needing a long setup or explanation.