How many Singularitarians does it take to change a light bulb? Zero; they let their extrapolated volition decide whether to change it.

I'm sorry, but this is exactly what I mean by overly obvious failed jokes. "Singularitarian" associates to - return the first cached thought - "extrapolated volition". There's no gotcha, no surprise.

Suppose you ask:

Q: How many Eliezer Yudkowskys does it take to change a light bulb?

If you let your mind return the first cached answer, it will come out something like:

A: Two. One to change the light bulb, and one to say something about the Singularity or rationality.

Hahaha dull thud.

You've got to say something non-obvious like:

A: One, but he has to write another twenty Overcoming Bias posts before he gets there.

A: One, because the thought of two or more Eliezer Yudkowskys is too terrifying to even contemplate.

A: The problem of changing a single light bulb without turning the whole universe into light bulbs involves so many hidden difficulties that you essentially have to write a complete Friendly AI.

A: The thirty-seventh virtue of changing light bulbs is the little screech it makes when you screw it in.

A: Two, because if you just said "one", it wouldn't be funny.

Etc. Think past the first thought!