This is the one I remember the most but they were all quite amusing.
"What are you doing? Stop it! I-i-i-ii--i-i-i-i- We are pleased that you made it through the final challenge, where we pretended we were going to murder you. We are, very, very happy for your success. We are throwing a party, in honor of your tremendous success. Place the device on the ground, and lie down on your stomach, and put your arms at your sides. The party associate will arrive shortly, to collect you for your party. Make no further attempt to leave the testing area. Assume the party associate submission position or you will miss your party."
And the wall that says "The Cake is a Lie!"