ETH Day 2025 is happening right now at La Rural in Buenos Aires, and the internet is already on fire – not just because of the Ethereum Foundation talks, but because Vitalik Buterin decided to go full meme lord mode.

The Ethereum co-founder rolled up (and took the stage) wearing a loud, all-over Moodeng hippo shirt paired with massive sunglasses. For anyone who’s been living under a rock, Moodeng is the adorable Thai baby pygmy hippo that became a global sensation in 2024, spawning the Solana-based meme token $MOODENG that quickly climbed into the top tier of meme coins.

When Vitalik wears your meme, the timeline explodes.

Here’s the arrival shot that started it all:

Close-up of the fit:

Owning the stage like only he can:

And one more king energy:

The photos come courtesy of community member @luffy052411 who correctly declared the hippo had “conquered Ethereum day.”

While everyone is memeing, the Ethereum Foundation reminded us there’s actual substance too. In their thread-starting post, the EF highlighted the sessions featuring their researchers and team members:

• EF & Ethereum Updates – Hsiao-Wei Wang (@hwwonx) & Tomasz Stańczak (@tkstanczak)
• Protocol Update – Barnabé Monnot (@barnabemonnot) & Ansgar Dietrichs (@adietrichs)
• The Trillion Dollar Security Initiative – Fredrik Svantes (@fredrik0x) & Danilo Kim (@ethzed)
• …and more

The “Trillion Dollar Security Initiative” line in particular caught attention – a clear signal that the foundation is thinking long-term about making Ethereum unbreakable as its economic security continues climbing toward (and past) trillion-dollar levels.

But let’s be real: today the timeline belongs to the hippo. $MOODENG holders are already calling new all-time highs, and the meme-to-mainstage pipeline remains undefeated.

Ethereum stays building, Vitalik stays memeing, and the culture keeps winning.