A neat thing about how memory works is that surprises tend to stand out more. It has something to do with how the brain can recognize new information as opposed to old information you just forgot. We tend to pay more attention to new experiences, especially when there's some emotion (good, bad or otherwise) attached to it.

It's why we vividly remember things like plot twists and "drops" in songs. It's the sudden change in expectations.

I don't remember learning most of the things I learned in school. School was boring.

I do remember learning the whole "I before E except after C, or when sounding like A as in NEIGHBOR and WEIGH" thing because we were reciting it as a class and the teacher called me out for just mouthing the words. I spelled just fine, but I didn't know the "lyrics" of what we were reciting so I faked it and then tried to claim that I did know them.

She wanted me to recite it in front of the class. I think I may have died of embarrassment because I don't remember what happened next. I do remember studying the fuck out of that stupid rhyme at home, ready to embarrass her the next time she tried to say I didn't know it. I never did get to prove her wrong though.

tl;dr Stupid jingles are memorable to our lizard brains that deliberately remember surprising/intense moments and forget almost everything else.