Check and adjust the alignment of your laser pointer or module. This is a spin-off from another 'ible which is currently under construction. I bought a green laser pointer and took apart the 'easy bits' which in this model was only the focusing lens of the collimator. (The collimator is a pair of lenses which align the laser light from the diode into a parallel beam.) I then had the problem of getting the focusing 'spot on' again, and came up with this method. To do this, you will need a fairly advanced camera with a zoom function and 'manual' mode. Also a dark place, a couple of tripods (or other way of holding camera and laser steady) and a piece of matt black paper. Do not try this if you cannot manually set the aperture and speed on the camera as it will not work.
http://www.instructables.com/id/Get-Your-Laser-Pointer-Spot-On./