Because the binmen always miss their bin
and they wanted to draw attention to it in as many languages as they knew in the hopes that the binmen would comprehend at least one?
(
in vino veritas,
Sun 28 Jan 2007, 17:58,
archived)
Haha
That's quite likely to be the answer!
(
thistle,
Sun 28 Jan 2007, 18:06,
archived)