You know what would definitely make weddings more fun? Animatronic robots of the bride and groom. These "look-alike welcome robots" take the place of boring welcome boards and greet guests with details about the couple.
The robot can be fashioned to look like an actual person, and can converse with people in pre-recorded snippets. When it detects someone nearby, it greets the person and responds to questions.
The possibilities for pranks are endless. If I ever get married, I plan to have one of these whisper "Help me please. I'm the real bride. The robot took my soul and switched places with me. You. Must. Stop. Her." [Japan Probe]