I Never Had Any Marbles To Begin With

All My friends say I'm insane
I half believe it myself

My marbles
I don't remember any marbles
When did you last see me with marbles?
NEVER!!
Ha, I knew you were lying

I'm telling you I don't have any of those small glass balls
You say I do!
Well
What colors were they?
How large?
Can you tell me anything?
No...
Well then I guess our conversation is finite
Good day to you sir!
And give me back my melon.