When the host started giving her farewell speech, her microphone was completely switched off and she kept on speaking for almost a whole minute without noticing she wasn't being heard at all. Then, when they brought her a backup microphone, she started over again, but the backup microphone was also switched off from the TV signal, and even though her voice was faintly heard from what other microphones around picked from the auditorium speakers, TV viewers at home were barely able to hear these first words again, until they got the audio fixed after a few seconds.
Al Bano, performer from Italy, forgot the lyrics of his song while he was performing, and started humming "na, na, na, na, na, na, na..." until he remembered the next line.