My little brother's was both the best and the worst wedding I've ever been to in many ways. The mother of the bride stood up to make a speech and it was just insane. She opened with "eeee would have been giving this speech" (pointing at the bride's stepfather), "but he's just had a gastric band fitted". She finished by saying how she didn't feel she was losing a daughter, but she was gaining a friend ... in (daughter's name).
The bride's family didn't speak to any of us for most of the reception, there was an invisible line across the room with the two families on each side. The bride's little brother with learning difficulties destroyed the cake by punching it repeatedly before anyone could get a piece. My family all got drunk and had a food fight during the reception. My little brother slept with someone else the night before the wedding and they separated the week after the wedding.
This was nearly 20 years ago, but we still laugh about it. God I wish someone had filmed that speech from the bride's lunatic mother, it was amazing.