S4E21: I Take Thee Quagmire
Gentlemen, I give you Crystal Pepsi.
All the great taste of regular Pepsi but without the troublesome opacity.
Well, what if you're drinking a regular Pepsi and somebody is coming at you with a knife, huh?
You won't be able to see him past your Pepsi.
And--And then, who's dead, huh? You.
You! You're dead! Stabbed!