You cast the mouse into the darkness, anticipating the explosion on the surface. You can't see anything but you're imagining the devastation that's about to take place...strip...pop...pop...pop...BAM! A monster from the deep inhaled your fly. Yeah, you're exhausted, but just one more cast after landing this one...
Filthy Rats come in 3 sizes - small, medium, and large. I usually bring one of each size along for a night trip, but the small was designed with brown trout in mind and the medium and large were designed for larger predators like bass and pike (and Murray cod!).
The small features a #2 hook up front, the medium a 2/0, and the large a 6/0.