I was watching this David letterman episode where he interviews charlie sheen and charlie says ... David no one has a job like you, nobody can be like you I am just dropping paint off the roof.
I am paraphrasing but here's the video around 1:30
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Letterman actually says "I'm dropping paint off a roof." He's trivializing his own work in a humorous way, in response to Sheen saying that nobody is as powerful as he (Letterman) is.
David Letterman had a running gag called "dropping stuff off of a 5-story tower" back in the 80's. He's probably referring to this. I couldn't find one with paint, but here's one example:
It would be fun to watch a can of paint. :)