During the Apollo 11 landing, a misconfiguration caused the guidance computer to activate the 1201 and 1202 program alarms, signifying that the computer was overloaded and dropping low-priority tasks. This was connected to the master alarm system to get the crew's attention; the alarms distracted the crew and may have contributed to the long hover time and marginal fuel state on that landing. In actuality the 1201 and 1202 errors were not extremely serious, though the uncertainty of their cause at the time was a big concern.
In November 1968, NASA engineer Bill Tindall wrote a delightful memo recommending against tying a low fuel warning to the master alarm precisely because it was an expected occurrence: "just at the most critical time in the most critical operation of a perfectly nominal lunar landing mission, the master alarm with all its lights, bells, and whistles will go off."
The film Apollo 13 portrays the master alarm as a red light with a loud repeating buzzer. Is that reasonably accurate? Would that buzzer have gone off during the 1201 and 1202 alarms during the Apollo 11 landing?