Parties where you're only allowed to
wear either
red,
yellow (
amber) or
green depending on how
willing you are to make out with someone.
Of course, there's more
fame (for the boys) related to wearing green and pulling a red girl than the opposite. Sadly, I haven't ever been to one myself - but I'd like to come - probably wearing a green hat, yellow shirt and red pants (you can
kiss with me - maybe I'll allow you to put your hands on my naked skin, but there's no way I'll have sex with you (of course, there's nothing I'd like more - but
it's all about the
signals, right?)).