I'd say nature is the best example. Natural hazards with immediate and predictable effects are much like the joker. It hurts producers and freeloaders equally,

I'd say nature is the best example. Natural hazards with immediate and predictable effects are much like the joker. It hurts producers and freeloaders equally, and everyone sees them coming. The dutch 'polder' politics seem like a very fine example of this. I imagine predators are another example. As are very periodic floods or droughts.