It's difficult for me to give this trailer an unbiased review because there is a clause in my contract with life that says: "Any movie screened as a luxury on Big Brother is guaranteed to be a waste of your time. It will never be good. Don't even think about seeing it." Yes, the Big Brother houseguests will rave, but these are people who chose to live in a house with a bunch of strangers and no intellectual stimulation for 90 days. So, keep that in mind when you read what I'm about to say about What Happens in Vegas: Ick. Okay, granted, we get a glimpse of Floyd from 30 Rock, Lake Bell and Treat Williams to kick things off. But those are short-lived, and then we're stuck with all Ashton Kutcher and Cameron Diaz all the time. And it's not pleasant. Apparently a very haggard-looking Cameron (seriously; high definition has ruined her for this world) was dumped by her boyfriend (Floyd), and Ashton's dad (Treat) fired him. So, of course, they both head to Vegas. Because ... what else do you do when you're down, right? While in Vegas, they meet, get drunk, hook up and get married. And then, before they part ways, he wins a huge payout at the slots. So, she suddenly wants to stay married to get her half of it. He wants a divorce. In court, judge Dennis Miller sentences them to marriage (because that happens all the time). So Ashton pulls out all the stops to try to get her to leave. He even pees in the sink, which seems to be the latest movie trend (this is not a good thing, I assure you). I'm going to go out on two limbs here: 1. They fall in love, and stay married. 2. This movie is not good.

Reviews by people who have actually seen it:
Variety
Rotten Tomatoes