This one gets trotted out every time someone wants to demonstrate how terrible JavaScript is. You can do many of the same stupid things in many other languages

This one gets trotted out every time someone wants to demonstrate how terrible JavaScript is. You can do many of the same stupid things in many other languages too, and most of the examples in that quiz are pretty contrived. Do you have some real-life examples of things you've personally encountered, rather than crazy examples that no-one would actually write?