Then you see something out of the corner of your eye or in the corner of a mirror and when you turn around, there's nothing there. Imagine being Candace: You're alone, in a dark house and it's storming.
The first 'story', following Candace is probably the scariest one.What do Perry and Doofenshmirtz do? Get on the elevator without a word and continue the hunt. It doesn't help that they are dressed in the same outfit or that they're wearing normal clothes rather than costumes. When Perry and Doofenshmirtz are exploring Doof's castle during a costume party, they come across an elevator that opens and two identical twin girls walk out and down the hall, quickly and in unison with blank expressions on their faces.
You know, sometimes it's amazing Doof turned out as well-adjusted as he is.
Only Phineas managing to warn Candace saves them. Then, in order to make sure they can't be sent back, set the boys's machine to self-destruct, meaning they were totally willing to leave the kids in jail. To begin, they trick the boys and their friends into switching minds with them, trapping the kids in prison. When Doof tries to stop him, Liam merely decides that he'll just turn Doof into a trophy as well. After Doof hired him to trap Perry, Liam decides that he wants to turn Perry into a trophy.