Most anime producers and writers (usually 20/30-somethings) are telling stories using their own memories of high school. So, until recently you didn't even see *cell phones* in high school anime. So old memes tend to stick around because a lot of what anime sells is nostalgia for "high schools that never were but should have been".
I kind of wonder if the bucket meme is in the same category as the "sweatdrop" or the "nosebleed" now. It is a metaphorical indication that the student is in trouble (like sweatdrop = tense or nosebleed = omigodbrainzjustmeltedfrombeauty)
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