If you really wanna confuse them, use "Zulu". Unless they have exposure to military or aviation, they'll have no idea what you're talking about.

Fun related anecdote, my wife works in a medical lab and occasionally has to call a doctor to report critical values. She frequently uses the NATO phonetic alphabet (her dad was Navy) for patients with names that are hard to pronounce or have an odd spelling (Who names their kid "Heathyr?"), and one time, the nurse taking the note actually filed a complaint against her for using "weird" words to spell out a name.