You know the routine… Presenter walks up to the mic and never trusts the engineer, double checks the mic is on by tapping vigorously, and everyone in the room is welcomed with a high (or low) pitch whine.

5 versions to choose from, all spine tingling irritating:

0:03 – Microphone Tap Feedback 1
0:03 – Microphone Tap Feedback 2
0:03 – Microphone Tap Feedback 3
0:03 – Microphone Tap Feedback 4
0:03 – Microphone Tap Feedback 5