Elon Musk's Boring machine

[gellfex]

@stinkinbadgers

Or it bumps up against the joke about the economists and the $100 bill on the ground.

I don’t know that one, but googling “joke about the economists and the $100 bill on the ground” was pretty amusing even though it didn’t turn up your joke.

Edit: found it here http://www.workjoke.com/economists-jokes.html