I'm a very oblivious person, so this might have been going on for some time, but can anyone tell me what I've done (if anything) to cause the Brightness bar in my MacBook Pro Display prefs to pulse (click on image to get ~300KB movie)? It doesn't do this on my Intel iMac or my PowerBook. Does it do this on all MBPs? Is my Mac insane? Did I click on some pref elsewhere and just never noticed this side effect?