They're not the only ones headed there, however, as wood craftsman Jack Fuller (ASHTON KUTCHER) has finally been fired from his job by his boss who also happens to be his father, Jack Fuller Sr. (TREAT WILLIAMS). Along with wife, Judy (DEIRDRE O'CONNELL), he's upset that his young adult son can't commit himself to and/or complete anything. Now unemployed, Jack and his best friend, incompetent lawyer Hater (ROB CORDDRY), opt for a Vegas trip to get away from it all.

The four accidentally end up booked in the same hotel room, and after meeting that way, end up partying all night. The next morning, Joy wakes up in Jack's bed and learns to her horror that they got married the night before in a drunken stupor. They agree that was a mistake and quickly having a falling out, but then find themselves in an unusual situation when he puts the quarter she gave him into a slot machine that results in a $3 million payout.

Unable to agree on who should get the money, the two end up in court where the judge (DENNIS MILLER) decides their punishment should be having to live together as husband and wife for six months. Not only that, but they must also attend marriage counseling overseen by Dr. Twitchell (QUEEN LATIFAH).

The two aren't happy with the arrangement, but decide they can put up with anything for their half of the earnings. With encouragement from their friends, however, they separately decide to sabotage the other in terms of being a good and faithful spouse. From that point on, and using various tactics, the unlikely couple must contend with such ploys, all while trying to figure out how to live together.

While most every state and many a city has their version of the same, the one place that's been most prominently displayed of recent is Las Vegas. Possibly because it's also known as Sin City, the convention and tourist popular destination has recently been touting, "What happens in Vegas, stays in Vegas." In other words, come and enjoy the city's many "amenities," but don't worry about anyone back home finding out.

As the apprentice said to the master, "That's easier said than done." A night of partying, gambling and more could lead to debt back home, any number of police charges or -- when lust rears its head -- an unexpected pregnancy, a venereal disease, or even a shotgun marriage.

It's the latter that fuels "What Happens in Vegas," an opposites clash romantic comedy starring Ashton Kutcher and Cameron Diaz who end up hitched after a night of excessive drinking and the need to get out of their respective funks. For him, it's being fired by his father/boss (Treat Williams) while she's just been dumped by her steady boyfriend (Jason Sudeikis) when she thought they were about to set a wedding date.

With the obligatory best friends in tow (Lake Bell for her, Rob Corddry for him), they set off for Vegas, accidentally meet, and wake up the next morning as unexpected newlyweds. They agree that was a mistake and are about to do the "stays in Vegas" part when a quarter and one-armed bandit result in a payday of $3 million. Since they can't agree about who the money belongs to, a judge (Dennis Miller) forces them to live together for six months before any decision can be made, and orders them to see a marriage counselor (Queen Latifah).

Since they despise each other (mirrored by their best friends) when the booze-induced lust is no longer flaring, they and the film end up playing out like "The Odd Couple" or any number of other films pairing people whose personalities and lifestyles don't mesh. The twist is supposed to be that they then separately decide to sabotage the other's attempts at being a good spouse, hoping that will help convince the judge to send more or all of the gambling money their way.

While most such pics that utilize one or both of those elements don't always end up working, sometimes they do, such as the highly entertaining "Mr. & Mrs. Smith." Of course, that film benefitted from the presence of and performances by Brad Pitt and Angelina Jolie, not to mention a smart script and fun direction.

Alas, Kutcher and Diaz are no Pitt and Jolie, separately or combined, and director Tom Vaughan and writer Dana Fox fail to emulate what Doug Liman and Simon Kinberg did in their enjoyable 2005 flick. About as predictable as they come (even for this genre that's known for that very quality) and with the tactics deployed by both parties ending up banal at best, the film offers few laughs, little to no chemistry between its leads (regardless of being adversarial or romantic), and thus ends up unable to engage or entertain its audience.

Throw in wasted roles by Williams, Latifah and Dennis Farina, not to mention grating performances by Bell and especially Corddry (who might want to return to the small screen after this and the equally pathetic role in the latest "Harold & Kumar" flick), the result is a pic that many a viewer (and most likely all but a few critics) will wish had stayed in Vegas or anywhere else but the screen in front of them. While it develops a little heart at the end, it's too little too late to make up for the uninspired, lame, predictable and decidedly unfunny material that dominates the rest of the offering. "What Happens in Vegas" rates as a 3 out of 10.