The human race.
By holding the bulb up to the socket and waiting for the world to revolve around them.
Just one. They hold it in place while the world revolves around them.
Because he wanted a PRIME-MATE! sorry ...sorry twice if this is an old joke
You know they are going to keep coming back, and despite the fact they are weaker each time, you still don't look forward to them.
Because they're not garbage collectors.