The world’s best golfers can talk about how fast Oakmont’s greens will be for the U.S. Open this week — and they have been since they started showing up for official practice rounds Monday.

The Stimpmeter can put a numerical value on that speed. Oakmont’s greens are expected to check in a little under 15, which is a lot — significantly more than the 13.5 at Pinehurst for last year’s U.S. Open, for example.

But it’s difficult to get a real feel for how fast the greens are — ever putt in your bathtub? — without seeing them in action.

Thankfully, some social media content creators have provided examples over the last few days.

Jon Rahm watches as a practice putt makes a hard left turn and slides away.

Justin Thomas wants to see for himself on the Stimpmeter.

Scottie Scheffler got a look at how the No. 18 green is shaping up.

If the USGA ever approves the underhand pitch putting technique, Oakmont would not be the place to try it.

The don’t use the Stimpmeter on fairways, but at No. 1 at Oakmont, they could. Zac Blair from 122 yards out. He’s got a putter.

So why are Oakmont’s greens this ridiculously fast? It might just be a matter of mowing.