Amazing pictures show a couple driving down a slipway, entering the water and cruising past homes in an amphibious Land Rover.
The clip on Twitter shows footage of the couple driving a Tanks Alot vehicle into the Thames while the driver declares that the handbrake won't work in water but they've got an anchor.
Laughter can be heard from spectators as the woman passenger squeals when the Land Rover hits the water, before the engine fires up.
There is also video of the Land Rover motoring in and out of Culham Lock.
Valonia tweeted: "Keep an eye out on the Thames for this amphibious Landrover today. Heading down river from Abingdon."