jinx and snap

Suzannah e-mailed to ask about the rituals involved when two people say the same thing at the same time. In the US, the schoolyard tradition is to say jinx! (For a discussion of the etymology of the word see World Wide Words.) In general, a jinx is a kind of curse. After simultaneous speech, one tries to be the first to say jinx (or to jinx them, for it can be a verb too), after which the "jinxee" is "cursed" by not being allowed to speak. Wikipedia elaborates the rules as:

"Jinx" is also a term used when two people say the same thing at the same time and the person who says jinx first makes the other person not speak until somebody says his or her name. The only prevention for this state is to yell the word "buttercup" after the jinx. This can be countered by "Jinx no buttercups".

This shows up a limitation of Wikipedia--the rules here are undoubtedly the rules that the author has experienced, but there are plenty of other rules too, since regional variation is rife in children's games and playground activities. (So go now and add your own rules to Wikipedia!) In Suzannah's experience:

When I was in school, if two people said the same thing at the same time you hurried to say "jinx" first - whoever lost wasn't supposed to talk until someone said their name. A bystander could also say it, and both of the people involved would be caught. I learned from a friend who grew up in another area that "pinch poke you owe me a coke" was the answer to this situation, or sometimes just "jinx you owe me a coke". I saw in an old movie (and another friend said she'd seen it in person) where the two people stopped for a second in their conversation and linked pinkies when this happened, then kept going.

(I think we played with something like Suzannah's rule--but usually we just got bored with our friend not being able to talk so we'd unjinx them.) Over at The Law of the Playground there are some more versions. OED doesn't have this sense of jinx but does note that the word is 'orig. U.S.'.

Better Half says that he knows jinx from his days on a South London playground, where they said jinx and fainites. (Though BH remembered the word as "fainlights", making it difficult to look up. Some kind folks at the American Dialect Society set us straight on the spelling.) Fainites (and variations on it--OED lists fains, fains I, fainit...) gives the sayer immunity from jinxing or touching.

Off the playground in BrE, one is more likely to hear snap, which is, as the OED puts it, 'an exclamation used when two similar objects turn up or two similar events take place'. This doesn't have the cursing connotations of jinx and is used off the playground as well. For example, when playing Scrabble, if I announce my score and my opponent has the same score, she might say Snap! or if you reach for something at the same time as someone else, one of you could say it.

This use of snap comes from a card game of the same name, which is similar to the game I played as a child called slapjack--but there are many variations of this game (and other names for it) that are of varying similarity to snap. (Here are two--including one in which one actually slaps jacks.) Essentially, one splits a deck of cards between two people; both lay a card face up on the table and continue doing this, piling the cards on one another, until two cards match (e.g. two jacks). The first one to slap the pile and say (BrE) Snap!/(AmE-dialectal) Slapjack! gets to keep the pile (or in some versions not keep it--depending on whether the aim is to have all the cards or none of them). For young children, one can buy snap cards with pictures.

In my house, slapjack always ended in tears and accusations, and sometimes with being sent to one's room. The name snap sounds much more civili{s/z}ed. But is the game?