You've heard enough about the bazillion uses for duct tape. What other objects are found in your life that you use for everything BUT what it was intended for?
For me it would have to be the lowly curtain hook. Sharp point on one end, severe bend, then gradual hook. Seems I use one almost every other week to fix or make something around the house, just today I used part of one to replace the "drive shaft" in my fish tank pump.