It's sometimes easy to forget where expressions like "top dog" and "big fish" come from. Here's a reminder: Tim Pruitt caught a blue catfish last weekend that weighed 124 pounds — bigger than many people. The Illinois Department of Natural Resources has confirmed the weight, and it appears to have set a new world record. And the catfish is still alive — in a tank at a Kansas sporting goods store. So the big fish could get even bigger.