The US President, on the final leg of a three-day trip to Vietnam before flying to Japan, held one of his trademark town hall gatherings with hundreds of youngsters in the country's buzzing commercial and creative capital Ho Chi Minh City.
The president received a huge cheer as he took to the stage in a one-party authoritarian state where politics is opaque and young people's voices are rarely heard.
Seemingly delighted with the exchange, Obama praised the journey of hip-hop "which started out as an expression of poor African Americans" and became a "global phenomenon".
He then appeared to take a thinly veiled swipe at Vietnam's authoritarian leaders, who regularly suppress critical artists.
"Imagine if at the time when rap was starting off our government had said 'No' because some of the things you say are offensive, or some of the lyrics are rude, or you're cursing too much?" he said.
Earlier another young man began his question with: "Mr President, you're so handsome."
To which Obama quickly quipped "Oh. You can just stop there if you want."
Another asked whether Internet posts about Obama's alleged marijuana smoking as a youth were true.
"I don't know if that's true," Obama quickly remarked, further dousing the issue with a warning: "Don't believe everything you read on the Internet."
But that particular exchange also prompted some soul- searching from Obama about leadership and growing out of a rebellious teenage phase prompted by the absence of a father.
Obama said he recognised the freedom western industrialised countries have had to pollute the earth for far longer than developing ones, but urged all countries to work together to prevent disaster.
"The problem is, if a country like China or Vietnam or India took the same development path the West did, we're all going to be under water.
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