If you heat lime (not the fruit!), with say, a blowtorch, it gives off a very bright light (think burning magnesium and you're half way there). They used to use this fact to make spotlights for theatres, hence the phrase "in the lime light!"
Sticking your index-and middle fingers up at someone as a sign of defiance dates back to the years of the longbow, where the French just loved to cut those finger's off of Brits so they couldn't make use of the weapon. The gesture thus was born, meaning, basically: "Look here you Frenchy, I've got my two fingers here, I can still kill you with my trusty longbow, mwahahahahah"
If you heat a jelly baby over a bunsen burner it gives off a very bright white light and makes a screaming noise!