"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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Girl: You idiot! You came inside of me! Boy: I don't have time to explain why I don't have time to explain *vanishes* *12 years later* Girl: So this is your son who you've never met before.. Boy to son: I could tell you about that time why I didn't have time to explain but I could explain *vanishes*