Rob has an amazing personality, and an even better sense of humor and it shows in some of his best quotes:

• When you read the [Twilight series], it’s like saying ‘Edward Cullen is so beautiful I creamed myself’. I mean every line is like that. He’s the most ridiculous person who’s so amazing at everything.I think a lot of actors tried to play that aspect. I just couldn’t do it. And the more I read the script, the more I hated this guy, so that’s how I played him, as a manic-depressive who hates himself. Plus, he’s a 108 year-old virgin, so there’s clearly some issues there.
• [On fighting with Cam Gigandet] I kicked his ass, because I don’t hold back. I fight like a little bitch. I’d bite and pull his pants down and stuff.
• Fan: ” I LOVE YOU ROB!!!”
  Rob: “Good”
• [When asked how he creates his hair style] I get 12 year old virgins to lick it
• I don’t have much of a sense of personal hygiene.
• Twelve was a real turning point for me as I moved to a mixed school, and then I became cool and discovered hair gel.
• The stuff I find attractive in women I always regret finding attractive. I always like a kind of madness in a woman… I like it when they hate me right from the beginning.
• Up until I was 12 my sisters used to dress me up as a girl and introduce me as Claudia!
• I’m really afraid of getting hit by cars, like terrified of it. I’m terrified of crossing streets. I’m also very accident-prone…I think people aim for me.
• I’ve got a terrible memory—I end up repeating myself quite a lot. The only thing I can remember is that I’m going to repeat myself!”

Gathered from multiple sources.