Interesting stuff! Korean 3 is different than what I remember. My version is a bit purer of a tongue twister.

들에 콩깍지 깐 콩깍지 안깐 콩깍지

Grew up in a trilingual family, learned a couple more, definitely the hardest tongue twister, by far.

Growing up in Indonesia, we had "Kuku kaki kakekku kayak kuku kaki kakakku" (my grandfather's toenails look like my older sibling's toenails). The repetitive k-sounds are brutal.

What's interesting is how tongue twisters reveal what's phonetically tricky in each language. English struggles with s/sh transitions ("she sells seashells"). Indonesian targets the k-cluster combinations.

Curious if there's research on whether practicing tongue twisters in a second language actually helps with accent reduction, or if it's just party tricks.

I found it a lot more difficult to read any of the tongue twisters due websites color scheme. For a moment I thought there's an issue with my brain!

A lot of them seem less like tongue twisters and more like plays on homophones, for English, at least.