an actor’s method of preparation or questionable commitment to a role, there’s a plethora of reasons co-stars could butt heads. In some instances, these experiences can be so bad that it means they’ll never ever work together again.But for others, time heals their wounds and they’re able to at least co-exist on set again — even if it’s just for the fans’ sake. Other actors on this list didn’t just affect their co-stars, but members of the production team, too.Let’s just say there’s a reason why they tell you to meet your idols, let alone work with them and be crushed by their lack of professionalism.