It's February 29 — a day we only get to experience once every four years.
Our friends at Wikipedia say that a Leap Day is added every four years "to keep the calendar year synchronized with the astronomical or seasonal year" — an explanation that no doubt makes sense to Professor Farnsworth on Futurama, if not to the rest of us.
Unfortunately, the following memes don't quite explain the phenomenon, either — but they have an amusing time trying.
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Check out our collection below.
Continue to see more of our Leap Year memes gallery.