The last time I saw something like this, I believe I was playing Goldeneye. This hacked-together pocket superlaser is guaranteed to start either conversations or fires — or conversations about fires. We tested out another laser the other day and found it sufficient for lighting a candle, but this one appears to be rather more powerful — and you can gank it out of a Blu-ray player.
The full instructions are here, but it’s not for the faint of heart of shaky of hand. Still, it’s totally awesome. Needless to say, in any project to do with lasers, wear eye protection. Also, don’t even try this in the first place. Are you crazy?