There’s always one
There was a trend for a while of giving out instant cameras to your wedding guests so that everyone could capture parts of the night that the couple might have missed. Whilst this seems a cute and personal idea it always ended with someone taking the camera to the toilet and doing something distasteful.
However, even with the professional photographer being the only official documenter of the night, you will still always get one guy who decides to photobomb all of your tender moments. Hopefully, your photographer will be good at editing.