1 Mercutio: Hey Will, how many members of a demographic or occupational group does it take to change a lightbulb?
1 Shakespeare: Er... how many?
2 Mercutio: N+1. One to change the bulb and N to act in a stereotypical manner.
3 {silent beat}
4 Shakespeare: Sometimes your metahumour is just too bizarre, Mercutio.
4 Mercutio: I never meta humour I didn't like...

This is the ur-lightbulb joke, on which nearly all lightbulb jokes are based. As such, it is an example of metahumour.

The fact that it is used as a point of discussion in this strip, and that the final gag is a pun on the discussion of the metahumour, makes this strip metametahumour.

And you know, I never meta metahumour I didn't like.

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2015-04-20 Rerun commentary: How many Sumerians does it take to change a lightbulb?

None, they used oil lamps.

(The Ur-lightbulb joke.)