After defeating the daancing couple, some booos, the butler, the fat dude, and the kitchen, spray the door with water and go outside to defeat spooky the ghost dog. Then his dog house will light up. examine it and it will start to suck you in. You are then in the graveyard. Knock on the graves to get life, but watch out because some of them have ghost skeletons. Then go up to the big grave. Bogmire will show up and you go to a creepy graveyard arena. Suck up his clones (they are black and don't cast shadows) and turn them into balls. Blow them at Bogmire and he gets stuck in a blob. Then just suck him up but watch out for his clones. They will knock you over and you will have to shoot him again. after this you talk to E gadd after opening a chest with the key to area three. You then go back to the lab.