[nsxwolf]

Why was there a pronounced dip right before it exploded? It’s like watching the tide roll way out before a tsunami hits.

[thomassmith65]

It might be just a quirk with the corpus Google uses.

If it's not a quirk, then it is probably due to one usage of the words (eg: "So you got this angry customer, see?") peaking in the 1940s, and a different usage (eg: "You can do it... you got this!") rising in the 2000s.