I came across this sign while I was attending a software design methodology course at an IBM building in London.
After wondering several times why each time I tried to go to the toilets I ended up in the restaurant, I looked carefully at the sign.
Which way would you go at a glance? Which way do you go, knowing that problem exists? The answer may be grokked from the picture, or, read “To Restaurant/Toilets Sign” at This is Broken. (Via Sivacracy.)