Hacker News Books

There is a library called Dispatch that has/had this problem entirely, the author decided to use symbols instead of natural language method names and left it fairly undocumented, so you had to spend time reading the source to have any idea what was going on. To the point where a kindly soul decided to write a periodic table (http://www.flotsam.nl/dispatch-periodic-table.html) to help people with its use.

I wouldn't say it was particularly dangerous, but it is a massive pain to deal with (it also means you can google for any help with a particular method).