If they were asses to you the whole time you worked there, burn the bridge.   
 
-Is there a watercooler?  Get your hands on some LSD and put it in.   
-Deflate the bosses tires on your way out. 
-Drop a rock down the vent of porta potty 
-Fill the cup part of your coworkers thermos with coffee and screw the lid back on. 
 
I need more details on what kind of construction and what materials you have access to.
		 
		
		
		
		
		
		
		
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