Ok your only allowed to add 4 words to the sentence, and you have to continue on the pre-existing sentence.

You can do a fullstop if you want (only where it fits)

A full stop doesnt count as a word.

Ok here's the first bit.

"Johnny really likes it"
I play guitar =]
Couldn't have come up with a more exciting title could you?

Things like this have been done many a time.