I've had some dozens of viewquakes, most minors, although it's hard to evaluate it in hindsight now that I take them for granted.

Some are somewhat commonplace here: Bayesianism, map–territory relations, evolution etc.

One that I always feel people should be shouting Eureka — and when they are not impressed I assume that this is old news to them (and is often not, as I don't see it reflected in their actions) — is the Curse of Knowledge: it's hard to be a tapper. I feel that being aware of it dramatically improved my perceptions in conversation. I also feel that if more people were aware of it, misunderstandings would be far less common.

Maybe worth a post someday.