Some students living in MIT's Random Hall dormitory created a web server that is linked to the doors of all of the bathrooms in their building.

You can visit the bathroom server at this address:
http://bathroom.mit.edu/index.html

In addition to being able to keep track of when MIT students visit the bathroom, you can also leave them messages, via the Foo Bathroom Display.

The server returns output similar to this, along with a graphical floor plan representation:

Bonfire K has been vacant for 14 min
Bonfire L has been occupied for 5 min
Pecker L has been occupied for 10 min
Pecker K has been vacant for 5 min
Clam K has been vacant for 19 min
Clam L has been vacant for 8 min
BMF L has been vacant for 51 min
BMF K has been vacant for 30 min
Loop K has been vacant for 9 min
Loop L has been vacant for 14 min
Black Hole L has been vacant for 15 min
Black Hole K has been vacant for 16 min
Destiny K has been vacant for 9 min
Destiny L has been vacant for 27 min
Foo has been vacant for 21 min