I was once sat at a pub by a canal on a pretty perfect summer afternoon. It was glorious weather, so all the outside tables were packed. Someone appeared opposite the pub, on the other side of the canal with an amplifier on wheels and a microphone. They set up and started speaking... But there was just a touch of wind, and they were on the other side of the canal... So other than the fact that they were probably talking about Jesus we couldn't make out what they were saying at all. An awkward sermon for all involved.