What's that one scary movie?

it the one when only the kids can see the monster thing. and in the commercial the mom is making the bed and the monster shows up under the sheets.

The Messengers. Not a great movie, but worth watching once.

The Messengers. Has a few scary moments, but overall it's not very good. Might be worth checking out though.

OMG! UMMMM.... monterrrr something.

Actually, it's a ghost~a harbinger, not a monster, that is shown. They're correct: The film you're asking about is "The Messengers", which I've watched a couple of times though I was extremely disappointed in it. Don't go in with high expectations, and I'm sure you would find it entertaining. Sadly, I thought it was going to be much, much better.

Generally, I don't judge on first viewing, so I try to watch a film at least three times before dismissing it or suggesting it.

IMDB summary:
It's been six years since the Rollins family just up and left, and now the troubled Solomon family has come from Chicago to rebuild their lives following their son's hospitalization due to their daughter's drunk driving accident. But, as they start to settle in, something odd and strange begins to occur to their son. Could something supernatural be at work...?
http://www.imdb.com/title/tt0425430/

messenger

the messengerss