How about "I'm Not Telling"

I can envision the amusement when being interviewed or just asked the question...

Them: "So, what's the name of your band?"
You: "'I'm Not Telling'"
Them: "Why not?"
You: "I just told you"
Them: "You said you weren't telling"
You: "No; 'I'm Not Telling'"
Them: "Huh?"