"I don't have time to explain why I don't have time to explain"
Create a situation you'd use it in, and have fun with it.
Call in to work...
Boss: Is everything OK?
Me: Sir I don't have time to explain why I don't have time to explain! *Hangs up phone*
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Professor: 'explain time' You: 'i don't have time to explain why i don't have time to explain' Professor: ....'thats not what i asked'