Four. One to change it and three to write the environmental-impact statement.
Oh, it's a really obscure number. You've probably never heard of it.
None, they just watch it burn out and follow it around for 30 years.
Four - three to cut a hole in the roof and one to change the bulb.
Three. 1 to screw it in and 2 to talk about how much better Neil Peart could've done it
Because they're too high-strung. Corny I know, but I wrote it myself and had to put it out there.
A ball-point Penguin!
Biologist 2: Oh it was quite ribbiting.