How to screw google and yahoo ?

Heard the news about yahoo upping their email service ?
My idea was to use my yahoo mailboxes to store my mp3z so I can access them from anywhere. I used to use my gmail mailbox to take foolab backups.
An interresting idea popped out of Youssef's head.
Do you want to screw both gmail and yahoo ?
upload a gig to your gmail account, and let it forward them to your yahoo account which'll forward it to the gmail account and ..........

Hmmm, What's going to happen ?

Now this reminds me of the photo below:

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