--'at what does watermelon laugh when it's murdered.' That was intriguing enough that I did the search myself, and found this page. I'm not sure exactly what it is, but I gathered that it was a line from a poem by Pablo Neruda, and, searching further, found this.
--'I chopped down the house that you had been saving to live in next summer'. That turned out to be from 'Variations on a Theme by William Carlos Williams' by Kenneth Koch. Here it is, from this site:
Variations on a Theme by William Carlos Williams
I chopped down the house that you had been saving to live in next summer.
I am sorry, but it was morning, and I had nothing to do
and its wooden beams were so inviting.
We laughed at the hollyhocks together
and then I sprayed them with lye.
Forgive me. I simply do not know what I am doing.
I gave away the money that you had been saving to live on for the
next ten years.
The man who asked for it was shabby
and the firm March wind on the porch was so juicy and cold.
Last evening we went dancing and I broke your leg.
Forgive me. I was clumsy and
I wanted you here in the wards, where I am the doctor!
-- Kenneth Koch
That's two excellent discoveries. I must read my referrers more often.