The place is called the asylum it's a mental patiant type haunted house with scrubs and crazy people you know mental patiants but ummm I need some saying I can't think of many to yell at the people to scare them this is what I've come up with "im not sick you people are the ones that are sick!" and "why dont you hang around for a little bit!" (while dangling a noose in front of them) so yeah thsta all I've got so... please help yo

don't these things come naturally to you? Or am I the only one who can think of a million weird things to say to freak people out and possibly ruin the moment
you have to let your imagination flow and absorb the role you're playing.
start meowing or something. I don't know. Do random things that are sure to freak people out.
easy peasy.

Ooh, from the simpsons. When people start to walk away, say "See ya later....MUCH later..."

I would probably eye a person every few groups, and just say "Yes...he/she will do nicely..." or "Ah, the perfect specimen!"

And don't script it!! Sound genuinely messed up! And you'll do fine

Okay well when you do your first day or night at the haunted house you should get a good feel of what scares the group the most. So on that note the rest of the night do creepy things like twist your neck or arm a weird way that won't hurt you and start screaming as if it hurt like possessed people do. Or say something like IDK... like... ask for a chainsaw to use there your problem is solved!