[1970] Research telescope mirror shot w. handgun
IAUC 2209: Report on 2.7-m reflector
http://www.cbat.eps.harvard.edu/iauc/02200/02209.html#Item1
2.7-meters Telescope mirror shot 7 times (1970)
https://news.ycombinator.com/item?id=41459161
Image: looking down the tube at the primary mirror. The dark circles in the lower right quadrant are bullet holes. An unhappy employee shot up the mirror in the 1970s. The holes reduce the telescope's light-gathering
power by about 1%. Source: https://starhopper.org/wp-content/uploads/2020/11/mcdonald.png