> OPERATOR: O.K., Robert, you understand that what you just described isn’t really lunch, right?
> ROBERT: It is lunch. When there are no rules, it is lunch, Cherise!
> OPERATOR: Did you at any point dip the green peppers in the peach yogurt?
> ROBERT: Probably. Sorry.
So I don't think its that, 7 is still a very common "random number" here even though there is no special cultural significance to it.
“Lucky Number 7” is a common phrase, there was even a popular movie that played on this, “Lucky Number Slevin” (https://m.imdb.com/title/tt0425210/). It’s one of the first numbers I’d think of as a “lucky number.”