"Yellow Car" is a game played by
English schoolkids (and me).
It's simple. If you see a
yellow car (a rare occurance - this isn't
Manhattan!), you must
shout "YELLOW CAR" as fast as you can. The
last person to say "yellow car" loses this particular game and may be
punched in the
arm by each of his
opponents.
The game continues, unannounced, for the rest of time, hence, any time I see a
yellow car, I still say "YELLOW CAR" to avoid those
blows!
P.S. a
car is an
automobile, but
E2 could tell you that anyhow.