Her son had thought it would be funny if he were to change the Windows Default Sound Scheme to something different.
The lady in question had connected her laptop to a projector and a large PA sound system to deliver a presentation when she discovered the fault:
To make matters worse, the fault was revealed in full stereo to a packed meeting room!!
Our computer repair engineers very quickly removed the offending sound clip and replaced it with the normal Windows Sound Scheme.
The last we heard, the Son was still paying the price!