Q: How many Hegelians does

Q: How many Hegelians does it take to screw in a light bulb?
A: Two, of course. One stands at one end of the room and argues that it
isn’t dark; the other stands across from him and says that true
light is impossible. This dialectic creates a synthesis when the
bulb gets screwed in.

(Explanation : Hegel and Marx use a logical procedure called dialectics to seek
answers to seemingly mutual exclusive positions. Shortened it is “thesis,
antithesis, synthesis”. Thus ‘no light’ and ‘no dark’ can arrive at a middle
ground through logical examination ‘it’s dark but it can be made light’.)