At Aperture Science, there's a good amount of joking amongst test subjects and occasionally, if you're lucky, you can joke around Cave Johnson himself. Just do not, under any circumstances, bring his mother into the mix. Got it? No "your mom" jokes. No "Yo Mama" jokes. Not even a "That's what she said." Cave's very sensitive about those.
The penalty for joking about Cave's mom? No cookies. That's right, you'll find your Aperture Science Holiday Gift Package is missing the sandwich baggie of Mrs. Johnson's Made From Scratch Science Cookies. Then you'll have to watch everyone else enjoying delicious frosted sugar cookies in the shapes of familiar faces around Aperture Labs.