Outra sugestão (NAmE):
Speaking of which: Aproveitando o Ganho; Aproveitando a Deixa
Exemplo de uso:
A: "Bobby sprained his ankle after his game."
B: "Speaking of which, is the gym he plays at still open?"
"Speaking of which" means "while we are talking about this subject" though it is sometimes used to introduce a thought even though it does not relate to the matter at hand. [wordreference]
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