A Quote from Portal 1
GLaDOS
Please be advised that a noticeable taste of blood is not part of any test protocol but is an unintended side effect of the Aperture Science Material Emancipation Grid, which may, in semi-rare cases, emancipate dental fillings, crowns, tooth enamel, and teeth.
More quotes from Portal 1
Remember, the Aperture Science Bring Your Daughter to Work Day is the perfect time to have her tested.
This is your fault. I'm going to kill you. And all the cake is gone. You don't even care, do you?
Your entire life has been a mathematical error... a mathematical error I'm about to correct!
The Enrichment Center is required to remind you that the Weighted Companion Cube cannot talk. In the event that it does talk The Enrichment Centre asks you to ignore its advice.
Please note that we have added a consequence for failure. Any contact with the chamber floor will result in an unsatisfactory mark on your official testing record, followed by death.