Life of pi Memes

The answer is "Happy Pi Day!" and it's brilliantly encoded in these four images. Top left shows molecular orbitals (π bonds), top right is a literal pie, bottom left features "Life of Pi" (the movie with the tiger and boy on a boat), and bottom right shows the mathematical constant π. It's like a nerdy rebus puzzle that makes mathematicians giggle uncontrollably while normal people wonder why March 14th (3/14) causes scientists to buy baked goods. Math enthusiasts celebrate this day with circular foods and decimal recitation competitions because apparently that's what passes for a wild party in STEM fields.