Dirty Pirate Popsicles
I honestly have never made this one. Some time back a friend of mine made these for a backyard barbecue. They were quite delicious. However not being quite as hard as ice, we had to down it relatively quick. The ones in the picture were similar to my friend’s popsicles.

Ingredients
2 1/2 cups Diet Coke™
1/3 cup Captain Morgan™ original spiced rum
1/3/cup Kahlúa™
My friend told me that using Diet Coke worked better than the regular coke.
Wanting to make some for a nice form of distraction, I wanted to find out if a particular shape of popsicle would stay harder longer. Here is what I found out.
Slightly flat Coke will produce a popsicle that stays frozen longer. To quickly and manually flatten out the carbonation, empty out enough Coke from a 2-liter bottle to leave a 3-inch space from top of bottle to top of coke. Place cap back on and shake vigorously for 10 seconds. Set aside to leave bubbles to subside. - Dirty Pirate Popsicle
The following is taken from Quora:
Do Ice shapes matter? If so, which shape of Ice keeps my drink colder the longest?
The larger the surface area, the faster the ice will melt. A cube of ice will last longer than a flat slab of ice of the same mass. The shape with the smallest surface area per volume is a sphere.
A spherical piece of ice would melt slower than any other shape. There are moulds available to make spherical ice cubes, and they are favoured by some people who use them in alcoholic drinks because they take longer to water down the beverage.
That is right round popsicle moulds work best for any alcoholic popsicles!