I always listen through IEMs when cutting the lawn. On one occasion (playing something prog, very loud) I noticed the neighbour standing opposite with folded arms watching so I stopped & pulled out one earpiece to speak to him.
I then realised that the mower was not actually running - the chord had pulled out from its socket so I had been taking the dead mover for a series of 'walkies' back and forth for several passes across the grass.
He was laughing & so did I.
....a few months later I bought a cordless battery mower.