I found these cute little rocket popsicle molds at Dollar Tree. I got a set but didn't really look at them very hard until I got them home. They are small and 1 cup of liquid fills all 8 so I thought they would be good for small, cold treats like frozen smoothies. However, I noticed that the sticks were completely smooth and imagined that they would slide right out of the popsicles when frozen. I was right--6 out of 8 came out without their frozen treats attached.
So I tried a little experiment. I drilled holes in the part of the stick that was put into the mold. I used as large a hole as I thought could work, structurally. Then I cleaned them up with a sharp knife, inserted in the hole and turned until the slivers of plastic came off. Then, I sterilized them.
I only drilled out half of the sticks, then I made popsicles. When I tried to unmold them, not one of the plain sticks held its treat. However, 3 out of 4 drilled out sticks slid out properly. I did warm the outside of the mold in both cases.
So, don't despair at poorly designed popsicle sticks. Get out power tools instead!