Do you ever get the feeling?

While sitting at a table in a fast food restaurant that one of the other patrons might at any minute pull out a semi-automatic machine gun and paint the room red. That you’ve walked into a musical, but your the only one that doesn’t know the words, the dance moves and you can’t hear the music. The waitress is completely unable to see you despite waving your hands in an ‘I’m drowning over here’ way.