Pet rain gear.
Toilet paper roll cover.
Cell phone holder.
Tool belt.
Shower curtain.
Repair speaker cones.
Poor man's Viagra - two Popsicle sticks and duct tape.
Hold the plastic (or Mylar) on your car where the window should be.
Wrap a "365 Uses For Duct Tape" calendar for Christmas.
Hold up worn out socks.
Suspenders.
Tape keys to bottom of car so you never lose them.