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Title text: Certain hybrid events can only happen in certain locations where all the conditions are present; chasers flock to the area in and around Kansas known as tumbleweed-colliding-with-possum alley.

"Possible" but not "necessary" in some cases. Unless your favourite band is especially secretive about where they'll be performing.

Ice cream trucks less exciting than regular birds or regular clouds? Does Randall not like ice cream?

The SR-71 Blackbird is at the top right, but it's so far on the horizontal axis it wraps around to the left side.