Risa

I've been out of the loop on most of the recent series, but there still isn't really cursing like this in Star Trek, is there? I remember thinking it felt really natural to have the BSG reboot characters yelling "Frak!" all the time. Even though it was technically a PG cuss, the way they made every use of it come out so Anglo Saxon-sounding. It just makes sense that every once in a while someone's got to get some swears out, even in space.