Literally, that's all Elon Musk tweeted - just one word: "Ethereum".
https://twitter.com/elonmusk/status/1123033196642201600
And with Bitcoin going down, Ethereum stays up and is going up more at the time I'm writing this.
It should be $156.xx, but it's at $158.xx.
How high will it go? My guess is not too much, but we'll see.