I've been there, know the feeling well.  I agree - bad emotion that can lead to chasing, and that usually doesn't end well.  And even if it does, that's probably even worse as it reinforces a bad behavior.  When I'm feeling that way, I either look for stocks in that sector that haven't popped yet, or move on entirely to something else.  If I stare at it, my frustration grows.  I just tell myself, I'll never get wiped out by a purchase that I didn't make....