This is an sweet little hack for using nothing but a laser pointer to build a microscope thingy:
Plus, if you watch the video you'll be introduced to the Crazy Russian Hacker, who is as cool as his username suggests.
I've actually been surprised I haven't seen more uses for laser pointers. Up until now, the niftiest idea I had seen for a laser pointer was to mount it on your mini weapon of mass destruction as a super accurate scope.
Regardless, don't forget: Safety is Number One Priority!