One of the fun things about my job is that sometimes we get to go out and do stuff. A few weeks ago I got to go to a merchant marine academy and spend the day in their "ocean simulator." It's a giant pool, about 30 feet deep, that can simulate storms by creating 10-foot swells, rainfall, wind, and darkness. We learn how not to drown, if we're ever in a potential drowning situation.
Tomorrow I get to go out into the woods and play hide-and-seek. Of course, it's the first week of November and likely to be rather cold, but I get to spend the day running through the forest (more like slinking through the forest) while a gang of highly-trained assassins (hehe) tries to catch me.
What did YOU shout, as a kid, when you were sick of "seeking" and wanted all of the hiders to come in? It's not like it's written in a book somewhere; you just pick it up from the other kids. You know that game, where you whisper to a friend, who passes it on, and so on, until the message is completely changed? That's what happened to our hide-and-seek call over the generations. I mean, it's patently nonsense, but to me it means "stop hiding, you win, come on in." It obviously had some meaning once. "All ye, all ye out's in free?" Maybe. Weird. And I call myself a linguist. Pfeh.