None if nobody's looking.
Batman: So we match. Look, this isn't about me.
A: Because you can't see through walls, and you can't see anything at night anyway.
0, woman are so unrepresented in technology that this is not possible.
None. Mice can't change light-bulbs as they are mere rodents without the physical or mental ability to do so. Not to mention it's much safer for them to pilfer food in the dark.
Three. One to change it while the other two argue about how old the old one is.
None, it is a hardware issue!
They can't see eye to eye.
Brailleant ones. Sauce: Am blind.
