Very simple. I'll start with a 2 word phrase. The next person will then keep one of those words and add another to make a different phrase. 
Person 1: happy Halloween
Person 2: happy birthday
Person 3: birthday cake
And so on... Starting with:
Broken Glass.
			
				 
			
		
		 
     
     
     
     
	 
	 
	 
									