THEME:   last words of random phrases precede RACE   
GOOD ONES:     Embarking on something exciting {& theme}   OFF TO THE RACES   
Mist-ify?   ATOMIZE   
Pool room   CABANA [note two words]   
Marx not seen in films   KARL [I thought Gummo, a hard fit in four boxes]   
Some sky lights, to some   UFO'S [note two words]       
BTW:   Home to millions   SEA [is that South East Asia, Seattle, or the briny?]   
      Worst   PITS [it really needs "The" for the idiom]      
Crossing ANASEZI with SILESIA at the initial S- is a bit unfair in my book      
RATING: 
 
   Three grins = Loved it; Two grins = Enjoyed it; One grin = A bit bland for my taste; One teardrop = Not much fun