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.