I keep a roll of Gorilla tape in my PD cruiser at all times.
Can't begin to tell you how many cars I have repaired with it. It is probably a number approaching three digits.
Also, nothing better for a knocked down stop sign or other road sign than some Gorilla tape and some 550 cord. We have to sit at stop signs and direct traffic until the road crew gets there to repair it. 9 times out of 10 I can tape the sign back in place and tie it off with 550 and go sit in the car rather than stand in the middle of the intersection in the cold or pouring rain.
Last week I fixed a lady's car on the interstate with some duct tape and a can of snuff I found on the side of the highway. Her radiator reservoir cap had come off and was nowhere to be found. I carry a gallon of water in the trunk too and in no time had her back on the road headed to an Autozone to get fixed up.