I think he would make an excellent refuse collector. Or maybe a taxi driver!
i feel like the predators face is derpy
It could be possible. We need to teach our children how to protect themselves. But that is a strange question.
Could be her furnace. Could be leakage from sewer pipes (if the detector also detects other gasses.) Make sure the windows are all opened and get everyone out of the house, to be on the safe side. Put in a call to the number on the detector (or alternatively the general help line for city public works) to have a professional come in and assess the situation.
First of all, your question and the additional details are referring to two separate scenes. The Predator takes off its face shield/mask/helmet/whatev just before his fight with Arnold, because it's a show down. Just like a dude in an alley fight would take off his shirt, or a boxer would take off his gloves, it's showing that he's getting down to the basics for a good honorable and raw fight. Which is one of the Predators' admirable traits, they are honorable fighters. The predator laughs at Arnold to mock him, basically. Its laugh is its way of saying If I got down, yo're coming down with me. And remember, it can mimic human sounds, which is why its laugh sounded human. It's super creepy when you think about it.