"If you drop them from high places it's really difficult to put the pieces into a box afterwards."

There would always be bits missing which kind of defeats Sai's purpose in killing them in the first place.

"Why would I want it with something like that?"

Ah.

"Unless...you wanted to eat a cake with cyanide in it? Internal asphyxia through interfering with your body's ability to extract oxygen using your red blood cells. Did you want to try that?"

He looks very excited about it.