Go to a Dr, tell him you have a crook guts and the associated problem that goes with that. Say you think it's a viral 24 to 48 hour thing as it's made it's way through the family but you need a cert for work.
Send through the cert and claim sick leave for your last 1 or 2 days depending on how long he gives you. That will give them the shits.
Sadly I don't have any sick leave up my sleeve, or should that be "happily" I've used it all up before the redundancy came about.
Still have until May 5th that I need to suck up and get on with things, lets just say I won't really train said manager up all that well, some "trade secrets" might just be left unspoken.