Q. How many Twisted developers does it take to screw in a lightbulb?

A. Three to implement twisted.lightbulb, one to refactor it, four to whine until the API is documented, two to re-implement it as a C module, one to package it up nicely, but nobody uses the packaged lightbulb, because they need the newest light features, and then no one actually gets around to screwing it in.
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Q. How many Divmod developers does it take to reboot a server?
A. Four. One to drive, one to recompile the kernel and one to report the progress on IRC.
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