I've been watching some DS9 and Worf keeps saying something in Klingon and then qualifying "There is no human word for this" and then he finishes explaining this completely Klingon concept and I think Bullshit! Because it's always either horny, angry , a death threat or some combination of the three.
Sometimes the lengths the writers go to prove an aliens alieness is so obtuse.
In the aftermath of the baseball game episode where the evil Vulcan is mocking the human sentiment at the end i found it hilarious when Ezri says "Human? What? Human? Me? Did I forget to put my spots on this morning?"