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.