FILE UNDER: Things you NEVER want to see your star left tackle do.
San Francisco 49ers star offensive lineman Trent Williams posted video on his IG story which appears to show him in the driver's seat pushing 125 MPH in a super expensive Ferrari ... and it's concerning to say the least.
The video is shot by the driver as the speedometer ticks upward from the 90s into a top speed of 125 -- and you can see the whip racing by other vehicles on the Freeway.
Obviously, the driver is smashing speed limits and endangering other drivers -- all while Lil Durk's "Fabricated" blasts in the background.