Well, gigantic alien monsters and Weapons of Universal Destruction are one thing. Not pleasant but the sort of stuff a GL is warned about in basic training. But what about the more mundane side of life? When a two-bit crook takes you down with a pocket flashlight, that's just plain embarrassing! The most powerful weapon in the universe, "Green Lantern's Light", is negated by the fog lamp from a very ordinary automobile - is there something wrong with this picture?
Luckily they don't call Hal Jordan 'the greatest Green Lantern of them all' for nothing! Our quick-thinking hero has more than a few ways to get round a little old thing like a yellow impurity. And if all the usual tricks fail? Well, sometimes I think that's just Hal's excuse to break out a good old fashioned dose of fisticuffs. He does so like to "Zwok" it to them, after all.