TIL in 2022 archaeologists in Egypt found 18,000 inscribed shards of pottery, known as ostraca, which date to around 2,000 years ago. Hundreds of these tablets had lines of the same character or two being repeated (usually on both front & back) that were written by "naughty pupils" as punishment.
https://www.bbc.co.uk/newsround/60360466
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https://www.reddit.com/r/todayilearned/comments/1pu025y/til_in_2022_archaeologists_in_egypt_found_18000/