alt Hacker NewsSince Know Your Meme doesn't give the reference for why it's a lake, maybe not everybody is familiar with british lore:
The mythical Lady of the Lake:
Probably best known via Monthy Python:
Strange women lying in ponds distributing swords is no basis for a system of government. Supreme executive power derives from a mandate from the masses, not from some farcical aquatic ceremony.
In short: She teaches Lancelot arts and writing, infusing him with wisdom and courage, and overseeing his training to become an unsurpassed warrior.
https://en.wikipedia.org/wiki/Lady_of_the_Lake
https://tvtropes.org/pmwiki/pmwiki.php/Main/EnigmaticEmpower...
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Note that, at least in Thomas Malory’s telling, the arm holding Excalibur out of the lake is not the Lady Of The Lake, who is nearby on the lake. The arm holding Excalibur is neither named nor explained.
Sorry maybe I'm dense, but what does the lady of the lake have to do with this image aside from a body of water being present?
There's also Father Thames, the River God of London https://www.nationaltrustcollections.org.uk/object/1140390
Upright Citizens Brigade also has a few nice bits about the Lady of the Lake
This reminds me that Monty Python and the Holy Grail contributed actual historical knowledge about Arthurian legends to my knowledge base while growing up. Other examples of Python unintentional education include knowing the names of a myriad of obscure cheeses (the cheese shop skit), a shocking number of anachronistic synonyms for death (the parrot skit) and notable contributions of the Roman Empire (Life of Brian 'What have the Romans ever done for us?' skit).
While it didn't contribute to my GPA at the time, I'm sure I could name more notable philosophers than any other 8th grader in my school (philosopher's song skit). However, in high school it did spark the interest to look up and read about each of the philosophers in the song.