The first and most known random use for duct tape is making a working boat. the myth busters have done this as shown in my featured image from paper course.
How to build duct tape boat
1) build a frame you can tape around in the shape of a boat
2) buy a lot of duct tape
3) put overlapping strips of duct tape on the inside of the boat
4) repeat step 3 on the out side of the boat
5) enjoy your new water craft