"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: Do you have your assignment? You: No. Professor: Why? You: I don't have time to explain why I don't have time to explain. Professor: Why? You: I don't have time to explain why I don't have time to explain why I don't have time to explain.