While there are certainly powerful lasers available on the market (and more freely than they should be) a green laser of normal laser pointer power will seem very bright simply because your eye is much more sensitive to green light than to the red wavelength of traditional laser pointers. Your eye is not more susceptible to damage at the green wavelength however. Eye damage sensitivity peaks somewhere in the infrared. I don't know about today but originally green laser pointers were built with an infrared laser that pumped another laser and then was doubled in frequency in a non-linear optical crystal, if I remember right. One of the two wavelengths used inside the pointer was at or near the worst wavelength for eye damage. It was not supposed to leak out of the pointer but there were a number of cases of eye damage from green lasers that while temporary, were more severe than commonly seen from red lasers of the same power. So I'm not sure what goes on with green laser pointers or if they are still made the same circuitous way as the first ones.

I know all this because green laser pointers are extremely popular with amateur astronomers and amateur astronomers are extremely concerned with their vision. Some accidental exposures at very short range to to green laser pointer beams caused two people that I know of to have visual issues for two or three weeks and that doesn't usually happen with red pointers. Since your eye sees green light so efficiently when you hold a green laser at night and point it at something up in the sky you can easily follow the beam which scatters off dust particles in the air for such a long distance that it seems to reach right out and touch the stars. This makes them very handy for setting up a telescope and for pointing out things to other astronomers or to guests at public astronomy gatherings.

Most likely you are the victim of the unfortunate combination of a bored young student, a green laser pointer, and a keg of beer. I hope that is all it was and that it does not repeat.

Ken