For all stars, it's pretty important to acknowledge the millions of people who have paid them enough attention to make them famous. It's understandable when Hollywood stars get annoyed with paparazzi in their faces or endless selfie requests, but you'd think they'd be a bit more patient when they have encounters with fans. Unfortunately, some people have learned the hard way that sometimes the opposite is true. Here's a look at celebrities who are not always nice to their fans!