In Dutch culture, among school children we had (have?) this funny thing where you can type in 707, which upside down reads "LOL", which in Dutch actually means "fun" (which funnily enough kind of corrolates with the internet slang abbreviation "lol"). Then if you calculate 707 + 707, so lol + lol, you get 1414, which reads as "hihi", which is an alternative, more giggly version "haha". Actually it kind of works in English too now that I think about it.

Cool, in Czech "haha" (the regular one) and "hihi" (the more giggly/playful/naughty one) have the same relationship. I wonder what other languages use it.

I took a few semesters of Dutch in college, and pretty much everyone else in the (admittedly quite small) classes either had Dutch ancestry or was an art history graduate student auditing so that they could learn to read primary sources about Dutch painters as part of their research. Early on in my first semester, we learned how to explain in Dutch why we decided to take Dutch, and I had the distinction of being the only one taking the class "voor de lol", which even today still makes me chuckle due to how similar it is to the common English meme phrasing.