The phenomenon whereby the exact same set of facts is either celebrated or deplored depending solely on the political bias of the observer.
When a liberal writes that increased immigration is good because it leads to a liberal demographic shift, but then writes that conservatives decrying increased immigration are pushing "replacement theory," that's celebration parallax.
A mathmatical graph originated by the ancient greeks some two thousand years ago and still inflicted upon unsuspecting high school students today. Vastly inferior to the hyperbola, of course.
Math geek: I'm not merely eccentric, I'm a parabola!
Math teacher: now, class, graph this equation on your TI-83 calculators and tell me what kind of parabola it is.
Class: *groans*
A type of face one makes when angry. Involves the mouth frowning downwards to form an 'n' shape. Various different types e.g human parabola where the body also forms the structure of a parabola at the same time as the mouth.