Trying something a little different for marking event thresholds. The first crack and second crack lines shown here can be extensively customized and animated beyond good sense.
While light purple with Helvetica is maybe not the best choice, I think I like this a lot better than background coloring or point annotations.
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Here's the text moved a little farther to the left, yellow dashed line, orange text in the Penguin Attack font set to a larger size.
I don't have Comic Sans installed on this machine.