A giant blob of foam is swallowing up a street in Santa Clara, California.
Police say the strange cloud stems from a test of fire-suppression foam from a company near San Jose Mineta International Airport that went wrong.
The thick white foam came from Signature Flight Support, a business located right next to the airport by the San Jose-Santa Clara border, and has consumed the surrounding block.
Police said something went wrong while the company was trying to test its emergency fire suppression system.
The foam is said to be up to three metres, with one man riding a bike straight through it.
"Yeah, someone had to do it," the biker told KTVU. "We were on the other side and the officers over there were like, 'You should ride through.' And I was like, 'Okay, you guys don't mind?' So we decided to do it."
The company says the foam isn't toxic, though police are discouraging the public from playing in it, saying it can irritate the eyes and skin.
Police say they intend to just let the foam dissipate of its own accord.