Or
You could go off and donate some blood before hand instead, as they might not want it for a while afterwards.
Or if you're able to donate and haven't before you could go along anyway and seethe at all the people going on nice expensive holidays.
And if sex with Bernie or blood donation doesn't put the wank in your badger you could always email the nice people at Anthony Nolan and they'll send you a gorgeous tube for you to spit into, and a pre paid envelope to send it back.
G'wan you know you want to 