Circa 1991, L1011-500, with the digital display AP/FD glareshield panel.
The First Officer, new to the type, starts looking for the blue cross, due to one small section of the background panel lighting not illuminated.
Not finding the blue cross (they are there, but really hard to see) this 320 pound gorilla starts pushing with his big fat size 14 thumb, bent/cracked the electroluminicent panel, thereby rendering the nearby gas discharge displays inop.
Results?
New panel installed, to the tune of $126,000.
Said 320 pound gorilla was canned, forthwith.
Sometimes a bigger hammer is not the best way to proceed.