There seems to be a small box above you. 

  ooooooooo,    .---.
 o`        o   /    |\________________
o`  head   'oooo()  | ________   _   _)
`oo         o` \    |/        | | | |
  `ooooooooo'   `---'         "-" |_|
                                

It opens! A key falls on the floor. You wondering if someone locked you in here, or the door closed on its own.

There's only one way out now...