Well, things like that are basic if you know Latin. Or the creators want the character to appear intelligent. In the Lion King in 'Be Prepared', Scar says, "Of course, quid pro quo, you're expected to take certain duties aboard." He's an evil genius, thus even though he's the villain of a kid's movie and he speaks Latin!
What upsets me about the usage of Latin phrases is the misuse of them. A group of people who graduate from college are not Alumnis, they are Alumni. A man who graduates from college is not an Alumni, but an Alumnus. And a woman who graduates from college is not an Alumni, nor an Alumnus. She is an Alumna, and a group of women who graduate from college are not Alumni but instead are Alumnae.
Continuing with my rant about Alumnus and all of its appropriate forms, the mispronunciation of words like this frustrate me. Most people will say 'AH-luhm-nae', with the 'ae' being a long I sound. Ha. Alumni, going by Latin pronunciation, should be 'ah-loom-nee', given that U's are pronounced as OOH sounds, and I is more like EE, as in knee. AE is the way they spell the I sound in Latin.