The jawdroppingly-gross detritus that spills out of a mouse or trackball while it's being cleaned. Weeks, months, or - heaven forbid - years of unidentifiable dreck, caught by a technological crumb catcher.
Where does it come from? Why does it stay? How does it all fit? Nobody knows.
sorry about the double load of mouse fuzz all over your floor - the trackball was giving me Warcramp and I couldn't find a trash can