So I have Opera open browsing Anandtech as usual. I press F7 by mistake, some odd tab pops up then Opera freezes. Then I hear this very fuzzy and loud music that sounds like an ice cream truck and CPU usage from Opera is about 60%. I kill Opera and the sound goes away. It's like Opera is singing opera. WTF? I can't find out what F7 is supposed to do. It seems to do the same thing as F4. Another weird thing is, I press the number 4 and the page totally hides. Then I click on the page's tab and it reappears. No, I'm not joking. The other numbers seem to zoom the font to VERY minute sizes. Something must be seriously f'd up with my Opera.