Valuations are going nuts for all sorts of startups and yet debate rages as to whether we are in a bubble or if, for instance, an app that lets people send self-destructing pics is obviously worth $15 billion.

VC Sam Altman argued in a blog post that all this talk of a bubble is "boring" even though its clearly a "fun" thing for journalists and other investors to ponder.

He thinks we are not in a bubble and he's so sure he's right, he ended the post with a bet to any VC that wants to take the opposite stand.

"The loser donates $100,000 to a charity of the winner’s choice," he wrote.

To that journalist-turned-VC Michael Arrington had the perfect response:

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