Most companies who are thinking of cutting staff are really good at leaning on people to leave rather than pay out redundancy, and they put a lot of energy into that. I feel that winding them up is playing right into their hands.
Start job hunting now.. easier to do that if you are already in a job, rather than out and before you completely eff up your references. When you've lined up your next gig, you can plan a grand exit if that's what you like.
In the meantime, If they do call you in for written warning/disciplinary - it was just a joke and you thought he'd find it funny.
But try not to get sacked or disciplined, it will only follow you around and hinder your next phase.