I could say it's a symbol of supreme male verility, but then again you've seen me
Bull
If you travel through Spain there are huge billboards visible for miles in the countryside of that bull. On that website look at the Osborne Bull section (in English
) and there's a map of Spain showing where they all are.
Lots of Spaniards have that
sticker on the back of their car, so Spanish car, driver who can string a few words of Spanish together (especially useful to direct lost Spanish truckers around Manchester & Liverpool) and enthusiastic about hispanic culture, and ¡Voila! (that's French, by the way)
They also do similar
stickers in Portugal, but theirs are back-to-front, don't know if it's something deliberate to distinguish themselves from the Spanish.
Anyway - I wasn't the only one in a yellow
t-shirt