Biết trách ma là ai và Elon Musk không

What is the “cậu biết là ai không” format in Vietnamese?

Vietnamese gen-z TikTok creators run a popular quiz format on the streets: “Cậu biết X là ai không?” (“Do you know who X is?”). The setup pairs a Vietnamese celebrity, rapper, or YouTuber with a Western icon (Elon Musk, Taylor Swift, Cristiano Ronaldo) and watches whether passersby recognize the local name, the global name, both, or neither. The reactions reveal generational and pop-culture gaps.

This clip plays the format short: a friend tests another friend on a Vietnamese figure, then on Elon Musk. The construction “cậu biết X là ai không?” is also a useful Vietnamese learner phrase for any “do you know...” question.