Mavity

What the 14th Doctor and Donna from Doctor Who accidentally influenced Isaac Newton to call gravity, through Isaac mishearing "the gravity of this situation".

This then goes on to be a running joke past the opening for Wild Blue Yonder (2023), e.g. in The Church on Ruby Road (Christmas special 2023).

Isaac Newton: "What was that delightful word Shavity. Havity.GASPS Mavity."

The 14th Doctor: "We've got air. We've got lights.
We've got mavity."

The 14th Doctor: "We could be inside a dust cloud
or a mavity well, or..."

The 14th Doctor: 'mavity field" (Wild Blue Yonder, 2023)

The 15th Doctor: "All the mass and density and mavity exist in the glove, not in you." (The Church on Ruby Road, 2023)