A large dollop of shit on your keyboard
This is what happens when you use your keyboard as a toilet. It smells and makes typing a very unpleasant experience. It gets all up your fingernails and down the cracks in between the keys...pretty nasty stuff, I'm sure you'll agree.
To avoid such poo you should ensure that no poo is released from your rectum onto the keyboard. But still watch out for Ian Huntley!!!!