1 Death of Insanely Overpowered Fireballs: {defiantly to the Head Death} You may have won this battle, sir, but the war for Deaths' rights has barely begun.
2 Death of Insanely Overpowered Fireballs: I may once again be compelled to collect souls when they are ready...
3 Death of Insanely Overpowered Fireballs: ... but until an insanely overpowered fireball goes off, I'm free to continue my campaign!
4 {scene change: the Mythbusters workshop}
4 Jamie: Well, adding pineapple to this gelatin dessert was pretty boring. Let's try it with thirty sticks of dynamite!
4 Adam: Yeah!

I first learnt about the risks of mixing pineapple with gelatin from Casey and Andy. Basically, pineapple contains the enzyme bromelain, which breaks down the protein that makes up gelatin, rendering it ineffective as a jelling agent in food preparation. So if you mix pineapple with your gelatin, you'll end up with a gooey mess. This only applies to fresh pineapple, because canned pineapple is heat-treated, which breaks down the bromelain.

The other point about this strip is that I used the term gelatin dessert rather than the British/Australian English term jelly or the usual American English term "Jell-O", which is a trademark and not a generic name. Normally I use Australian English, but in this case I wanted something that at least meant the same thing to all readers, rather than simply using "jelly", which would have meant something completely different to American readers.

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2014-12-19 Rerun commentary: Pineapples are not the only guilty culprits here! Kiwifruit and pawpaws (a.k.a papaya) also have enzymes which prevent gelatin from setting. Interestingly, they have different enzymes to pineapple: kiwifruit has actinidain, and pawpaws have papain. But all three will give your jelly a bad day.

I never used to like pineapple. Up until about a year ago, when I decided to try some fresh pineapple, and really liked it. So now I get a fresh pineapple every now and then. Yum!