Saying the Wrong Name
In this scenario, it was not the groom who said the wrong name. The groom’s sister was officiating the ceremony said the ex-wife’s name instead of the one standing in front of her! How awkward would that have been. Everyone attending the ceremony fell silent.
If you have seen “Friends”, you must have thought of the scene when Ross said Rachel’s name instead of Emily’s. At least, things were not so bad here. It was the sister who goofed up here instead of the groom. Imagine the embarrassment felt by the bride. She would probably remember this incident for the rest of her life.