Hollywood is like a person who has ADD. Anything and everything can change anytime, which drives celebrities to always be on top of their game. Unfortunately, it's not always the brightest days for many film and TV stars.

Nicki Minaj, Edrward Norton, Charlie Sheen - the list goes on and on. So without further adieu, here are some Hollywood's biggest names that got fired during filming with a little help from the folks at What Culture.

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1. Megan Fox - Transformers Franchise

Let's face it. Transformers needed more than the sultry Fox to save the movie from eternal damnation. However, Michael Bay had other plans for the actress, after laying her off. The reason? Fox didn't hold back in an interview when asked about the director/producer: "He's (Bay) like Napoleon and he wants to create this insane, infamous mad-man reputation. He wants to be like Hitler on his sets, and he is. So, he's a nightmare to work for."

2. Mel Gibson - The Hangover II

Mel Gibson has been struggling to land the perfect role ever since he went dark. Apart from a handful of cameos including in the film, The Expendables 3, there isn't really anything else going on for the actor/director. When he was finally given a break to appear as a tattoo artist in the hilarious, "The Hangover II," some cast and crew had very strong opinion against having Gibson on board.

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3. Ryan Gosling - The Lovely Bones

Ryan Gosling was so thrilled to play the role of the father in the film, that he went above and beyond the call of duty. Realizing his baby face won't cut it, he decided to down chugs of Haagen Dazs ice cream to put on some weight that will go well with his facial hair. Director Peter Jackson freaked out when he saw Gosling. No thanks to "creative disagreements," Gosling was left "fat and unemployed."

4. Lindsay Lohan - The Other Side, Linda Lovelace Biopic & Lindsay (TV series)

Lindsay Lohan has had the worst years of her career recently. Even Oprah Winfrey couldn't save the former Disney star from her fate. Apart from getting fired from The Other Side for being "unbankable," the crew behind Linda Lovelace's biopic decided that the "Mean Girls" actress was impossible to insure. Her self-titled TV series, "Lindsay" was not renewed for a second season.

5. Terrence Howard - Iron Man 2

Terrence Howard was widely acclaimed for his role as James Rhodes in Iron Man. The film even teased that he will be War Machine, come the sequel. When Marvel offered Howard to reprise his role for Iron Man 2 with a substantially lower cheque than he received before, the actor refused. Marvel justifies that his role in the sequel was set to be a lot smaller than the first installment.

However, the unofficial reason comes from reports that Howard was a nightmare to work with. He wasn't shy about letting everyone know how upset he was, claiming that he recommended Robert Downey, Jr. for the role and that Downey stole a part of his cheque.

Tags: Megan Fox Mel Gibson ryan gosling Lindsay Lohan Terrence Howard