Its a form of psychological warfare to begin talking about doing something before actually engaging in it.Why would you kick your wife over a joke? That's acctually fucked up
If it was a fun prank such as I burnt this , spent all our money etc that's fine but joking about breaking vows exposes your hidden mentality.
Never trust someone who tries to illicit an emotional response , double so if they hide it in the machevillian cloak of a jester AKA "Joke, prank etc"