Hmm ...
While I was working on a large corporate site, there was a medical emergency - first-aider, paramedics, ambulance, trip to A&E - in one of the training rooms.
Their employee giving the presentation, in order to connect the ceiling-mounted projector to his laptop, had climbed on an office chair (with castors) that he placed on a folding table, with predictable results.
The front-desk mounted connectors, next to his laptop, were all found to be working correctly as was the IR remote. He had just failed to use any of them.
Ironically the presentation was about health and safety at work, and the presenter ran that department.