Planes have had problems, but no fatalities yet, but the concern is really terrorists using the laser pointers to take down planes.
On a personal note, one of my friends was driving his car when some punk kid aimed the laser pointer at him, he didn't crash, but was stunned for a few seconds, it turns out they can damage your eyes.
That punk kid thought it was funny, but was to stupid to start running, and slow, my friend caught him, and tossed him a beating.