Obviously women are more susceptible to random and dangerous mood swings and irrational thought. Becuase such bouts of insensibility occur regularly and often and can last for quite sometime, it is the only sensible conclusion that women must not be allowed to vote, becuase it is very likely that nearly one quarter of all the voting women would be crazy at the time. Such a great risk is obviously not acceptable and women should be regarded as convicted felons and have their voting rights stripped.
Okay now for the next guy. Argue for or against abortion. Choose the side which you do not support and try to make an argument for it. I think this might be too hard though, so if everyone is too chicken just try "Pres. Bush is a good/bad president" again arguing for the side which you don't support.