The weather, the caterers, your hairdresser, your batty aunt Gail and her gammy leg - of all the things you worry about ruining your wedding, the last thing you probably consider is the vicar making erectile innuendo.
Well that's what happened to Lauren and Nick, an Aussie couple, whose big day was made memorable after an unfortunate pause in the registrar's speech left the groom red-faced.
Equally embarrassed, the registrar, who laughs along at first, pushes on with the ceremony despite the howls of laughter from the congregation.
The bride and groom, to their credit, enjoy the joke along with everybody else.
Check out a video of the incident below.