Resturant has rats

While enjoying our desert, a rat the size of my shoe, ran past our table to the kichen. When we enquired about it to the waiter.... He stated that there are some rats running around that where never cought. The employees of the resturant whom the rat run past acted like nothing happened. Few minutes later it was killed and we saw one of the managers passing with it (not even hiding it). We couldnt even fish our desert. This was really discusting.