Rafiki, not necessarily any quiz or contest is required for "boom " to happen.

What I always meant by "boom" is simply my upvote with my 100.00% voting power. As simple as that.

100% Upvote from an account with 2M+ Leo used to be quite noticeable.

"boom" can happen even for no reason at all. Or just as my sympathy sign to the author of the post.