It only takes two, but the trick is getting them in the lightbulb.
Two. One to identify that the lightbulb has indeed burned out, and one to call the maintenence man to change the lightbulb.
Nun.
Just one, but he has to see Radiohead do it first.
Two, but don't ask me how they got in there.
He did gnat see that coming
Trick question the rooster.
