The hole seems a little too small for you (and besides it's tresspassing) and so you ignore it and continue on the path. A little further on you come across a terrible smell! Holding your nose, you press on to see what's making it and come across an open manhole with it's cover to one side. The smell was coming from the sewers! Gross!
You decide to replace the manhole cover to stop the smell but you will need two hands to move the cover. Taking your hand off your nose the smell overpowers you and you start feeling funny.
Your body feels like it's constricting while growing fur at the same time. Your ears and nose grow larger and more sensitive, but while your nose is now a whiskered muzzle, the smell doesn't seem that bad. Your hands are now long and clawed and your feet feel the same. There is also a long tail snaking out from the bottom of your spine! You are now a 3-foot tall wererat, almost buried in your clothes.