Serifs gone crazy! They are legible and recognisable and at the same time jumpy, skewed and random! What makes it really cool is that every letter has 5 different versions - and they automatically cycle as you type. That will make your text look quite random and more authentic (rather than obviously repeating letters!)
Bonus Jerk also comes with a complimenting Box version - a handdrawn background layer, made to make the letters stand more out!