Not everybody has the stomach for them. But if you do, you have a fright-filled lineup to enjoy this Halloween season. The following four Amarillo haunted houses are ready to test your fears and your mettle. ■ You can be in the Chainsaw Massacre at 12851 Interstate 27. Because it is outside city limits, its website boasts that “there won’t be any city rules and code enforcement people to limit your terror!” It is open 8 p.m.