This happened when my brother went to get his daughter baptised.

The priest called my brother and his girlfriend to get their daughter baptised, so they took her to the church and the priest finished and said Amen and then the wooden benches in the back that you would normally see in church, squeaked really loud like people were getting up cause it was over and they looked back to see who was there and there was nobody there. The priest said wow I guess people came to see your daughter get baptised.