Go to the "Out of Controll" scoop that you get on day one after beating this person that needs an I love me jacket you get the small chainsaw which is one the strongest weapon's in the game as in how much hurt'n'pain it cause's. You can grab the Criminal Biology book in Sir Book a lot in Wonderland plaza on the second floor and then Enteraintment and Engineering books in Bachman's Bookpuriom in Paradize Plaza on the first floor. Grabbing all three of these books will make the small chainsaw last 27 times as long.