Notice: There could be some details left out, but if you do it right you should be fine. Please inform me if something goes wrong.
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Step 1: Get What You Need
-Coke still packaged in a bottle
-Spare time since it takes a while
Make sure the coke you're going to get is in a bottle and not a can. I'll explain this later on.
Step 2: Put the Coke in the Freezer and Let Freeze
In short get a bottle, and partially empty it. Then, shove it into the freezer. Make sure it's completely frozen when you take it out, or you'll fail.
Step 3: Processing the Coke Into a Slushy
Step 4: Cautiously Opening the Bottle and Boobytrapping
Just in case, wear safety goggles, and protect all valuables from a possible rogue cap.
You could also make someone afraid of soda bottles by setting that person up with a booby trap. First, get a coke bottle, and shake it vigorously. Place it in the fridge as if it was already sitting there since forever. When he/she comes by offer that person a drink. Pull out the coke bottle and give it, but excuse yourself because you have to get something and point out where the cups are. Tell him/her to keep their face away from the bottle as it has a tendency to "erupt" in a soda fountain. This will ensure that their face will remain intact during ambush time. Run away, normally, and wait for the scream that comes after the shock wave! Actually, there are two ways it can happen. One, you get a regular soda fountain. Two, you get the explosion. What you want is the explosion. I have also found that smaller bottle tend to explode more often when you shake them for a really long time, and there is only a few inches of air inside. Experiment on the ratios and ambush your prey!
Comment if you have any questions whatsoever.