Is there a trope for when a character defies the laws of physics/nature, but doesn't realize it for a moment, and so, because of this, the laws of nature don't take effect immediately, but only until after the character becomes aware of their situation?
Example: Dog chases cat. Dog accidentally runs off a cliff but doesn't notice the ground beneath it is gone. Dog stands in mid air for a moment. Dog realizes it's floating in air. Dog falls to the ground.