OK, so this is the guy from all those Mac commercials, Justin Long... He was also in He's Just Not That Into You, and Zach and Miri Make a Porno, among others. This is a recent clip of him on Kimmel, where he highlights his text chat with some rando... Apparently this high school girl accidently texted him, so he did what was right - he messed with her, ha! It's a good laugh...