One or two, ok it was twenty, years ago I worked for a motorcycle shop in Sydney (filling in for 4 weeks that became two years). When someone came and offered to decorate the window for Christmas we asked the owner what he wanted written. His response was "Bah - Humbug!" so that's what we told the guy to write. You should have seen the owner's face when he saw it.
We are still laughing about it (by email).
Love it!
