The most outrageous prank ever pulled off by Lex Luthor was made an official part of his and Superman's past. Lex's thievery of 40 cakes is infamous online and, thanks to a flashback from Clark, 100% canon in the DC Universe.
The origins of Luthor's epic baked good burglary can be traced to The Super Dictionary, an educational children's book designed to teach young minds basic concepts such as animals and the alphabet using iconic DC characters. Among the many heroes and villains helping assist in the learning was Lex Luthor, who helped kids understand the number 40 with an account of him stealing as many cakes. The idea of a rogue who frequently battles the Man of Steel taking the time to plunder a couple dozen cakes is so ludicrous, the internet couldn't help turning such petty villainy into a meme.
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And as the image of Luthor with cakes in tow spread like wildfire online, one creative team thought it pertinent to make it something the madman had actually done. In Superman #709 by J. Michael Straczynski, Chris Roberson, Eddy Barrows, and Allan Goldman, Superman continues his walk across America until he comes across Flash. The two decide to take a break in a local diner and begin a dialogue about morality. Clark regales Barry of a time he was sent to detention only to be joined by his future nemesis. While Superman admits the two were never really friends, he knew enough about the young Luthor to know that he was a bit of a troublemaker. Case in point, Clark mentions that Lex wasn't allowed to enter a potentially dangerous experiment into their school's science fair and as revenge, the young villain stole 40 cakes from the school.
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