This is possibly the most annoying phrase in the real-time-strategy game Starcraft.
The
basic objective of Starcraft is to make a
big army to destroy your opponent, however you have this
army-size limit known as 'supply' that can only be increased by building a specific building, and for the
alien faction 'protoss', that building is the pylon. So every
2-4 soldiers you build, you most build another pylon to sustain them. If you forget, a voice says "YOU MUST CONSTRUCT ADDITIONAL PYLONS", and at that point, you realise that you can't build any more guys until you send a worker to build the pylon, and then wait for the pylon to finish. Then, 4 soldiers later, you will have to build ANOTHER one.
What makes this phrase especially annoying is how often the
guy says it if you forget to build them, because soldiers of the protoss
race take up so much supply, and their pylons provide such little supply.
