Downtown there is a very old restaurant across from the main church in Belgrade. When the restaurant was first established in 1823, it was named Tomina Kafana. Later in 1878, its name was changed to Kod Pastira (At the Shepherd's), and even later on in 1892 when it changed owners, an attempt was made to call iit Kod Saborne Crkve (At the Saborna Church), which infuriated the clergy. Tired of many name changes, the owner put a large ? on the door, and Znak Pitanja (or Question Mark stayed). Here is a LINK if you want to read more.
In any case, I visited it recently with a friend and here is one happy waiter.