Hammock in 5 Minutes.

this Instructable shows one how to make a fully functional hammock in under 5 minutes with household supplies. 

Materials:
Sheet (twin)
knife (Or anything that cuts)
10 feet of rope.

cut the sheet in half lengthwise, or at about 2 1/2 ft from the edge if its not a twin. 

cut the rope in half, and tie each piece to the ends of the sheet using the sheet-bend knot.   http://www.animatedknots.com/sheetbend/index.php  will show you how, if you don't know.

the last step: tie to a tree and relax.
Note- it may look incredibly thin, but it will widen when your in it.