Chemists Will Enjoy this One
This meme is a load of chemistry humor in so many ways. First, the images show Samuel Jackson with a mirror version. Then it goes on to caption the images with Samuel-L-Jackson and Samuel-D-Jackson.
The jokes are in the L and D. To fully understand it, you have to understand the Chiral part of the meme. Chiral is simply a mirror effect that doesn’t change the molecular structure of the initial material. The initial molecule does not force its structure on the initial. That said, the meme points back to the images that look original individually and not an alternate of one.