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When people add extra letters into words seemingly at random, it's not (generally) because they're idiots. Instead it's due to something that linguists refer to as epenthesis. This is when someone's internal language radar for what sounds right -- known as phonotactics -- decides a word feels a little off, so it adds something to make the offending word fit the their schema better.

"Expresso" is a great example of this. "Espresso" feels weird in English because there's no hard consonant sound in there, and the rules of English generally dictate that words have at least one of those. So some people throw in that hard X because it fits their own internal rules for what they think English should sound like (as in "express"). Same reason some people say "somepthing" instead of "something," or why a native English speaker might pronounce the city of Hamtramck, Michigan as "Hamtramick." But this is where things get weird.

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There's no regional variation to explain why expresso sounds right to some people and not to others. At least with something like drawring, we know that's indicative of a British accent, as those Brits love to add and remove r's more or less arbitrarily. (R-bitrarily, if you will.) People of similar ethnic and socioeconomic backgrounds, who were raised in the exact same city, may differ in when and where they decide to insert vowels or consonants.

This is what stumps scientists about certain elements of epenthesis. While we understand the situations in which they occur (take Hamtramck up there; English isn't keen on three-consonant clusters, so throwing a vowel in there feels more normal), there's no rhyme or reason as to who will decide to do it. So the next time you want to throw things at someone for ordering a latte with three shots of SOMETHING THAT DOESN'T EVEN EXIST GODDAMMIT LITERALLY HOW HARD IS IT TO ORDER COFFEE I SWEAR TO GOD I WILL END YOU, maybe give them a break.