Languages are so different and alike from each other, and nowhere is this more evident than on this website which explores how each language standardizes the sound an animal makes, from the fairly agreed-upon "meow" to the hotly-disputed "oink."
A soundboard that lets you generate background noise by mixing together a variety of looping sources, from the mundane and useful ("I'm calling you from the coffee shop") to the purely hypothetical ("marching band vs zombie apocalypse").
I'm a big fan of cultural true crime — it rarely actually involves a crime, but it does feature the sort of obsessive fact-finding that feels like outright wizardry, weaving together a historical cloth from the thinnest of threads.
Maybe you know someone who is into modular synthesizers and have feelings about all the patch cables and apparently random knob-fiddling. If that's the case, proceed with caution as this browser-based programming language levels up the abstraction.