Working backwards from the joint premises that:
- we all have a strong primal urge to throw whatever we've got to anyone who holds up their hands half cupped together in the cross-cultural sign for 'pass it here!'
- when throwing things it's obligatory to shout 'go long' on the offchance that the catcher will retort 'I am long', facilitating everybody's feeling rather smugly witty,
we at Bastard have calculated that shouting "I am long!" obliges anyone in the area to throw to/at the shouter whatever object they can fastest throw in his/her direction.
This has turned out to be really useful if someone's holding something you want, since they'll usually end up throwing whatever's in their paws already, even if they don't particularly want to give it up. Also handy if you're feeling cruel and someone is holding something like a slice of their favouritest cake in the whole world (and you feel ready to dodge it).
Just so that I can feel I've covered all the bases, I should say please don't attempt to take advantage of this if you're sat in a particularly large crowd on a pebbly beach, or similar - we've already had some fairly serious biscuit incidents and wouldn't want you to get caught out like we were.
(Better than dubious social commentary, right?)