7. Tartle. Scottish – The act of hestitating while introducing someone because you’ve forgotten their name.
11. Schadenfreude. German – Quite famous for its meaning that somehow other languages neglected to recognize, this refers to the feeling of pleasure derived by seeing another’s misfortune. I guess “America’s Funniest Moments of Schadenfreude” just didn’t have the same ring to it.
15. Tingo. Pascuense (Easter Island) – Hopefully this isn’t a word you’d need often: “the act of taking objects one desires from the house of a friend by gradually borrowing all of them.”
All 20 can be found here.