12x Blu-ray laser built into a Star Trek (TOS) toy phaser, with sound effects! Answered
I know Kipkay did it first, but this is still awesomely awesomeful :-) I saw this on MAKE's blog; the original posting is from Jay at Hack'N'Mod. Using a 12x Blu-ray laser (405nm) running at 465 mW, this has enough power to blind you without eye protection. It's got a front focus with a properly styled ST:TOS nosecone, and two different selectable sound effects. Jay's writeup is a complete tutorial for building your own.